Discontinued Operations - Assets and Liabilities of Discontinued Operations on Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 6	$ 63	$ 35
Receivables, net	202	571
Other current assets	50	247
Deferred income tax assets	3,447	3,447
Total current assets	3,705	4,328
Property and equipment, net	6	276
Deferred income tax assets	17,446	17,446
Other assets, net	1,320	1,604
Total assets of discontinued operations	22,477	23,654
Accounts payable	65	32
Accrued expenses	443	710
Deferred tuition revenue		142
Remaining lease obligations	13,014	9,174
Total current liabilities	13,522	10,058
Remaining lease obligations	24,646	33,103
Other	198	223
Total liabilities of discontinued operations	$ 38,366	$ 43,384