Earnings Per Share - Additional Information (Detail) shares in Thousands	Sep. 30, 2023 shares
Earnings Per Share [Abstract]
Common stock, shares issued upon conversion of preferred stock	5,326

Common stock shares issued upon conversion of preferred stock.

No definition available.

Name:	sup_CommonStockSharesIssuedUponConversionOfPreferredStock
Namespace Prefix:	sup_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant