Summary of Quarterly Financial Information - Summary of Unaudited Financial Data (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2017
Valuation And Qualifying Accounts [Abstract]
Provisional tax expense due to impact of Tax Act	$ 99.9	$ 99.9

Tax cuts and jobs act of 2017 incomplete accounting provisional income tax expense (benefit).

No definition available.

Name:	skx_TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit
Namespace Prefix:	skx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration