Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Operating Leased Assets [Line Items]
Existence of option to extend	true
Lease option to extend, description	one or more options to renew, with renewal terms that can extend the lease term from one to ten years or more
Lease renewal term start year	1 year
Sublease income	$ 406
Right of use asset	54,452
Lease liability	$ 63,362
Weighted average remaining lease term	5 years 9 months
Weighted average discount rate	10.30%
ASC 842
Operating Leased Assets [Line Items]
Right of use asset	$ 54,452	$ 56,591
Lease liability	$ 63,362	64,877
Decrease in long term liabilities upon adoption of ASU		6,500
Decrease in accrued expenses upon adoption of ASU		$ 1,800
Maximum
Operating Leased Assets [Line Items]
Operating leases initial term	12 months
Minimum
Operating Leased Assets [Line Items]
Lease renewal term end year	10 years