Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Receivables [Abstract]
Balance, Beginning of Period		$ 23,142	$ 20,229
Charges to Expense	[1]	8,292	9,607
Amounts Written-off		(7,281)	(7,068)
Balance, End of Period		$ 24,153	$ 22,768

[1] Charges to expense include an offset for recoveries of amounts previously written off of $1.5 million and $2.0 million for the quarters ended March 31, 2017 and 2016, respectively.