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

Segment and Geographic Reporting - Geographic Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales, Total	$ 1,176,395	$ 1,094,829	$ 3,561,270	$ 3,193,571
Property, plant and equipment, net
Property, plant and equipment, net	565,395		565,395		$ 541,601
Domestic [Member]
Segment Reporting Information [Line Items]
Net sales, Total	523,281	514,235	1,648,642	1,595,078
Property, plant and equipment, net
Property, plant and equipment, net	392,891		392,891		382,426
Canada [Member]
Segment Reporting Information [Line Items]
Net sales, Total	44,646	46,979	146,080	133,362
Property, plant and equipment, net
Property, plant and equipment, net	9,730		9,730		9,888
Other international [Member]
Segment Reporting Information [Line Items]
Net sales, Total	608,468	$ 533,615	1,766,548	$ 1,465,131
Property, plant and equipment, net
Property, plant and equipment, net	$ 162,774		$ 162,774		$ 149,287