Leases - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) Facility	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessee Lease Description [Line Items]
Operating leasing arrangements initial term	58 months	58 months
Proceeds from sale of facility	$ 10,200,000
Gain on sale of facility		$ 13,904,000	$ 28,958,000	$ 33,510,000
Right of use asset	31,275,000	31,275,000
Operating lease liabilities	36,579,000	$ 36,579,000
New Facility Lease
Lessee Lease Description [Line Items]
Number of facility leases | Facility		3
Right of use asset	3,800,000	$ 3,800,000
Operating lease liabilities	3,800,000	$ 3,800,000
Extended Facility Lease
Lessee Lease Description [Line Items]
Number of facility leases | Facility		9
Right of use asset	7,100,000	$ 7,100,000
Operating lease liabilities	7,100,000	$ 7,100,000
Other Operating Expenses (Income), Net
Lessee Lease Description [Line Items]
Gain on sale of facility	$ 800,000
Minimum
Lessee Lease Description [Line Items]
Operating leasing arrangements initial term	1 year	1 year
Leases remaining lease terms		1 month
Maximum
Lessee Lease Description [Line Items]
Leases remaining lease terms		9 years