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

Segment and Geographic Reporting - Segment Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales, Total	$ 970,589	$ 1,094,829	$ 1,025,934	$ 1,072,808	$ 764,290	$ 942,417	$ 877,810	$ 978,794	$ 4,164,160	$ 3,563,311	$ 3,147,323
Gross profit	454,083	$ 519,987	$ 488,321	$ 476,498	356,212	$ 429,978	$ 416,254	$ 432,152	1,938,889	1,634,596	1,424,008
Identifiable assets	2,735,082				2,393,670				2,735,082	2,393,670
Additions to property, plant and equipment									135,976	119,471	118,144
Domestic wholesale [Member]
Segment Reporting Information [Line Items]
Net sales, Total									1,249,287	1,199,832	1,219,779
Gross profit									464,609	454,088	471,104
Identifiable assets	1,259,119				1,161,719				1,259,119	1,161,719
Additions to property, plant and equipment									20,055	33,677	38,080
International wholesale [Member]
Segment Reporting Information [Line Items]
Net sales, Total									1,729,906	1,391,235	1,094,395
Gross profit									786,675	616,110	454,665
Identifiable assets	1,116,928				954,874				1,116,928	954,874
Additions to property, plant and equipment									47,410	44,286	37,909
Retail [Member]
Segment Reporting Information [Line Items]
Net sales, Total									1,184,967	972,244	833,149
Gross profit									687,605	564,398	498,239
Identifiable assets	$ 359,035				$ 277,077				359,035	277,077
Additions to property, plant and equipment									$ 68,511	$ 41,508	$ 42,155