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, 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
Net Sales
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
Property, plant and equipment, net
Property, plant and equipment, net	541,601				494,473				541,601	494,473
Domestic [Member]
Net Sales
Net sales, Total									2,055,475	1,920,051	1,876,201
Property, plant and equipment, net
Property, plant and equipment, net	382,426				374,459				382,426	374,459
Canada [Member]
Net Sales
Net sales, Total									160,367	130,555	103,268
Property, plant and equipment, net
Property, plant and equipment, net	9,888				10,410				9,888	10,410
Other international [Member]
Net Sales
Net sales, Total									1,948,318	1,512,705	$ 1,167,854
Property, plant and equipment, net
Property, plant and equipment, net	$ 149,287				$ 109,604				$ 149,287	$ 109,604