Unbilled Services (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Unbilled Services [Abstract]
Unbilled services	$ 16,476	$ 19,187
Production supplies	1,619	1,737
Total	$ 18,095	$ 20,924

Total amount of unbilled services and production supplies to be used in the production process

No definition available.

Name:	sgk_UnbilledServicesAndProductionSupplies
Namespace Prefix:	sgk_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant