Unbilled Services (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Unbilled Services [Abstract]
Unbilled services	$ 16,654	$ 16,476
Production supplies	1,668	1,619
Total	$ 18,322	$ 18,095

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