Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Receivables [Abstract]
Balance, Beginning of Period		$ 21,008	$ 18,503	$ 20,229	$ 19,097
Charges to Expense	[1]	8,457	6,428	23,332	15,653
Amounts Written-off		(8,407)	(6,213)	(22,503)	(16,032)
Balance, End of Period		$ 21,058	$ 18,718	$ 21,058	$ 18,718

[1] Charges to expense include an offset for recoveries of amounts previously written off of $1.3 million and $1.4 million for the quarters ended September 30, 2016 and 2015, respectively, and $4.9 million and $5.1 million for the years to date ended September 30, 2016 and 2015, respectively.