Business and Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 State Location Segment Attendant	Mar. 31, 2015 Segment	Dec. 31, 2015 Segment
Accounting Policies [Abstract]
Number of students in degree programs | Attendant	43,000
Number of states where online programs are offered	50
Number of locations | Location	138
Number of states	39
Number of business segment | Segment	1	1	1