Leases - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)		Sep. 30, 2019 USD ($) Lease Facility
Lessee Lease Description [Line Items]
Operating leases expiration date			2028
Number of subleases			12
Number of facilities leased | Facility			8
Sublease income | $	$ 1,075	[1]	$ 3,332	[1]
Number of leases related to ongoing operations			9
Number of remaining leases related to Closed campuses			8
Minimum [Member]
Lessee Lease Description [Line Items]
Lease term range, years	5 years		5 years
Number of renewal options for extended terms	1 year		1 year
Operating sublease term			2 years
Maximum [Member]
Lessee Lease Description [Line Items]
Lease term range, years	10 years		10 years
Number of renewal options for extended terms	4 years		4 years
Operating sublease term			4 years

[1] Lease expense and sublease income represent the amount recorded within our unaudited condensed consolidated statement of income and comprehensive income. Variable lease amounts represent expenses recognized as incurred which are not included in the lease liability. Fixed lease expenses and sublease income are recorded on a straight-line basis over the lease term and therefore are not necessarily representative of cash payments during the same period.