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

Segment and Geographic Reporting - Geographic Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Sales, Total	$ 1,330,732	$ 1,353,998	$ 1,258,565	$ 1,276,756	$ 1,080,798	$ 1,176,395	$ 1,134,797	$ 1,250,078	$ 5,220,051	$ 4,642,068	$ 4,164,160
Property, plant and equipment, net
Property, plant and equipment, net	738,925				585,457				738,925	585,457
Domestic [Member]
Segment Reporting Information [Line Items]
Sales, Total									2,197,391	2,128,100	2,055,475
Property, plant and equipment, net
Property, plant and equipment, net	439,132				385,584				439,132	385,584
Canada [Member]
Segment Reporting Information [Line Items]
Sales, Total									167,963	171,864	160,367
Property, plant and equipment, net
Property, plant and equipment, net	7,286				9,081				7,286	9,081
Other international [Member]
Segment Reporting Information [Line Items]
Sales, Total									2,854,697	2,342,104	$ 1,948,318
Property, plant and equipment, net
Property, plant and equipment, net	$ 292,507				$ 190,792				$ 292,507	$ 190,792