Leases - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) Agreement
Lessee Lease Description [Line Items]
Operating lease, option to extend	Certain leases contain options to extend the initial term at the Company’s discretion
Operating lease, existence of option to extend [true false]	true
Weighted average remaining lease term	14 years 2 months 12 days
Weighted average discount rate	6.00%
Number of lease agreements assigned to third parties | Agreement	2
Future lease obligation under sublease arrangements | $	$ 5.4
Property One [Member]
Lessee Lease Description [Line Items]
Lease termination dates	2020-11
Property Two [Member]
Lessee Lease Description [Line Items]
Lease termination dates	2022-02
Minimum [Member]
Lessee Lease Description [Line Items]
Term of lease contract	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Term of lease contract	15 years