Cash, Cash Equivalents, Short-Term and Long-Term Investments - Additional Information (Detail)	12 Months Ended
Dec. 31, 2020
Maximum [Member]
Cash Cash Equivalents Short Term And Long Term Investments [Line Items]
Long-term investments maturity period	2 years

Cash, cash equivalents, short-term and long-term investments.

No definition available.

Name:	skx_CashCashEquivalentsShortTermAndLongTermInvestmentsLineItems
Namespace Prefix:	skx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration