Discontinued Operations - Summary Results of Operations for Discontinued Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Discontinued Operations And Disposal Groups [Abstract]
Revenue		$ (20)	$ 4,708
Operating expenses:
Educational services and facilities	$ 5,558	1,211	25,152
General and administrative	1,028	910	13,282
Depreciation and amortization	0	0	2,073
Asset impairment			68
Total operating expenses	6,586	2,121	40,575
Pretax loss	(6,586)	(2,128)	(35,601)
Income tax benefit	(2,690)	(997)
Loss from discontinued operations, net of tax	$ (3,896)	$ (1,131)	$ (35,601)
Net loss per diluted share	$ (0.05)	$ (0.02)	$ (0.53)