Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Receivables [Abstract]
Balance, Beginning of Period		$ 27,929	$ 22,551	$ 24,836	$ 22,534
Charges to Expense	[1]	11,432	6,730	23,154	13,743
Amounts Written-off		(8,631)	(5,013)	(17,260)	(12,009)
Balance, End of Period		$ 30,730	$ 24,268	$ 30,730	$ 24,268

[1] Charges to expense include an offset for recoveries of amounts previously written off of $0.5 million and $1.2 million for the quarters ended June 30, 2019 and 2018, respectively, and $1.4 million and $2.5 million for the years to date ended June 30, 2019 and 2018, respectively.