Skechers U.S.A., Inc. Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

Commitments and Contingencies - Additional Information (Detail) $ in Millions		12 Months Ended			84 Months Ended
	Apr. 17, 2015 Case Plaintiff	Dec. 31, 2017 USD ($) Case Claim Plaintiff	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) Case Claim	Oct. 06, 2014 Case
Commitments And Contingencies [Line Items]
Operating lease agreements expiration		Nov. 01, 2031
Rent expenses \| $		$ 223.7	$ 171.0	$ 137.8
Minimum percentage of interest-bearing open purchase arrangements		0.00%
Maximum percentage of interest-bearing open purchase arrangements		0.50%
Minimum financing days of interest- bearing open purchase arrangements		30 days
Maximum financing days of interest- bearing open purchase arrangements		60 days
Amounts outstanding under interest- bearing open purchase arrangements \| $		$ 177.4	260.7		$ 177.4
Interest expense under interest- bearing open purchase arrangements \| $		4.8	$ 4.4	$ 5.4
Open purchase commitments \| $		$ 943.4			$ 943.4
Number of personal injury cases filed		12
Number of personal Injury cases settled \| Claim					13
Filed As Formal Actions [Member]
Commitments And Contingencies [Line Items]
Number of personal Injury cases settled \| Claim					8
Plaintiff Fact Sheets [Member]
Commitments And Contingencies [Line Items]
Number of personal Injury cases settled \| Claim					5
Number of unfiled claims abandoned \| Claim					40
Superior Courts of the State of California [Member]
Commitments And Contingencies [Line Items]
Number of cases in dismissed		16
Superior Courts of the State of California [Member] \| Skechers U.S.A., Inc., Skechers U.S.A., Inc. II and Skechers Fitness Group [Member]
Commitments And Contingencies [Line Items]
Number of personal injury cases filed		72
Number of claims plaintiffs \| Plaintiff		920
LASC Coordinated Cases [Member]
Commitments And Contingencies [Line Items]
Number of pending cases		14			14
LASC Coordinated Cases [Member] \| Settled Litigation [Member]
Commitments And Contingencies [Line Items]
Number of claims plaintiffs \| Plaintiff		2
LASC Coordinated Cases [Member] \| Skechers U.S.A., Inc., Skechers U.S.A., Inc. II and Skechers Fitness Group [Member]
Commitments And Contingencies [Line Items]
Number of pending cases						3
Number of claims plaintiffs \| Plaintiff	647	68
Number claims settled and dismissed	57
Number claims partially dismissed		12
Number of claims plaintiffs fully resolved and dismissed \| Plaintiff		224
Number of claim dismissed in part		21
Personal Injury Lawsuits Involving Shapeups [Member]
Commitments And Contingencies [Line Items]
Number of pending cases		1			1
MDL [Member]
Commitments And Contingencies [Line Items]
Number of pending cases \| Claim		1			1
Number of personal injury cases filed					1,235
Number of personal Injury cases settled \| Claim					1,766
Number of cases in dismissed					72
MDL [Member] \| Settled Litigation [Member]
Commitments And Contingencies [Line Items]
Number claims settled and dismissed \| Claim		12
MDL [Member] \| Filed As Formal Actions [Member]
Commitments And Contingencies [Line Items]
Number of personal Injury cases settled \| Claim					1,154
MDL [Member] \| Plaintiff Fact Sheets [Member]
Commitments And Contingencies [Line Items]
Number of personal Injury cases settled \| Claim					612
MDL [Member] \| Superior Courts of the State of California [Member] \| Skechers U.S.A., Inc., Skechers U.S.A., Inc. II and Skechers Fitness Group [Member]
Commitments And Contingencies [Line Items]
Number of claims plaintiffs \| Plaintiff		360
Multi-Plaintiff Lawsuits [Member] \| LASC Coordinated Cases [Member]
Commitments And Contingencies [Line Items]
Number of claims plaintiffs \| Plaintiff		12
Number claims partially dismissed		12
Multi-Plaintiff Lawsuits [Member] \| LASC Coordinated Cases [Member] \| Skechers U.S.A., Inc., Skechers U.S.A., Inc. II and Skechers Fitness Group [Member]
Commitments And Contingencies [Line Items]
Number of cases in dismissed		28
Multi-Plaintiff Lawsuits [Member] \| LASC Coordinated Cases [Member] \| Skechers U.S.A., Inc., Skechers U.S.A., Inc. II and Skechers Fitness Group [Member] \| Settled Litigation [Member]
Commitments And Contingencies [Line Items]
Number of claims plaintiffs \| Plaintiff		1
Single Plaintiff Lawsuit [Member] \| LASC Coordinated Cases [Member]
Commitments And Contingencies [Line Items]
Number of cases in dismissed		2
Single Plaintiff Lawsuit [Member] \| LASC Coordinated Cases [Member] \| Settled Litigation [Member]
Commitments And Contingencies [Line Items]
Number of claims plaintiffs \| Plaintiff		2
Single Plaintiff Lawsuit [Member] \| LASC Coordinated Cases [Member] \| Skechers U.S.A., Inc., Skechers U.S.A., Inc. II and Skechers Fitness Group [Member]
Commitments And Contingencies [Line Items]
Number of cases in dismissed		1
Individual Plaintiffs [Member] \| Superior Courts of the State of California [Member]
Commitments And Contingencies [Line Items]
Number of cases in dismissed		17
Individual Plaintiffs [Member] \| LASC Coordinated Cases [Member]
Commitments And Contingencies [Line Items]
Number of pending cases		0			0
Number of cases in dismissed		17
Number of claims plaintiffs \| Plaintiff		17
Equipment and Automobiles [Member]
Commitments And Contingencies [Line Items]
Operating lease agreements expiration		May 01, 2021