Business and Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($) State Location Facility	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) State Location Segment Attendant	Jun. 30, 2015 USD ($) Segment	Dec. 31, 2015 Segment	Dec. 31, 2016 Location
Business And Summary Of Significant Accounting Policies [Line Items]
Number of students in degree programs | Attendant				40,000
Number of states where online programs are offered | State				50
Number of locations | Location	137			137
Number of states | State	39			39
Number of locations closed | Location	1			1
Impairment charge | $	$ 317		$ 0	$ 985	$ 0
Number of business segment | Segment				1	1	1
Building and Other Long-lived Assets [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Impairment charge | $		$ 668
Facility [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Impairment charge | $	$ 317
Number of facility | Facility	1
Scenario, Forecast [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Number of locations expected to be closed | Location							1