Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Receivables [Abstract]
Balance, Beginning of Period		$ 24,153	$ 22,768	$ 23,142	$ 20,229
Charges to Expense	[1]	6,918	5,268	15,210	14,875
Amounts Written-off		(6,497)	(7,028)	(13,778)	(14,096)
Balance, End of Period		$ 24,574	$ 21,008	$ 24,574	$ 21,008

[1] Charges to expense include an offset for recoveries of amounts previously written off of $1.2 million and $1.6 million for the quarters ended June 30, 2017 and 2016, respectively, and $2.7 million and $3.6 million for the years to date ended June 30, 2017 and 2016, respectively.