Significant Accounting Policies (Details) $ in Thousands	6 Months Ended
Jun. 30, 2015 USD ($)
Graduation fund liability
Balance at December 31, 2014	$ 9,706
Revenue deferred	7,753
Benefit redeemed	(1,845)
Balance at June 30, 2015	$ 15,614

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to graduation fund liability.

No definition available.

Name:	stra_GraduationFundLiability
Namespace Prefix:	stra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant