Leases - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) Term	Feb. 29, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Lessee Lease Description [Line Items]
Operating lease, description		The Company leases facilities and certain equipment under noncancelable operating leases with remaining lease terms of 1.3 years to 10.7 years, some of which include options to extend for up to two five-year terms.
Operating lease, option to extend		true
Operating lease, options to extend		some of which include options to extend for up to two five-year terms.
Weighted average remaining lease term		9 years 8 months 12 days
Weighted average discount rate		4.70%
Capitalization of right of use asset		$ 40,300
Capitalization of lease liability		40,300
Restricted cash		5,770		$ 4,787	$ 4,787	$ 4,826
Corporate Office Space Lease Agreement
Lessee Lease Description [Line Items]
Operating leases arrangement term			10 years 7 months			10 years 9 months
Corporate Office Space Lease Agreement | Letter of Credit
Lessee Lease Description [Line Items]
Restricted cash		$ 3,100
California | Corporate Office Space Lease Agreement
Lessee Lease Description [Line Items]
Minimum lease payment amount	$ 51,400		$ 25,300			$ 50,400
Lease commencement period	first quarter of 2021
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease remaining lease term		1 year 3 months 18 days
Maximum
Lessee Lease Description [Line Items]
Operating lease remaining lease term		10 years 8 months 12 days
Operating lease, renewal term		5 years
Number of renewal option terms | Term		2