Leases - Additional Information (Detail) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020 USD ($) Lease Facility	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Lessee Lease Description [Line Items]
Operating leases expiration date				2028
Number of subleases | Lease		5
Number of facilities leased | Facility		4
Sublease income	[1]	$ 494	$ 1,075	$ 1,845	$ 3,332
Asset impairment				$ 612
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		1 year
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		3 years

[1] Lease expense and sublease income represent the amount recorded within our unaudited condensed consolidated statements of 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.