Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 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	$ 393	$ 799
Right of use asset	52,266	52,266
Lease liability	$ 61,397	$ 61,397
Weighted average remaining lease term	5 years 10 months 24 days	5 years 10 months 24 days
Weighted average discount rate	10.30%	10.30%
ASC 842
Operating Leased Assets [Line Items]
Right of use asset	$ 52,266	$ 52,266	$ 56,591
Lease liability	$ 61,397	$ 61,397	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	12 months
Minimum
Operating Leased Assets [Line Items]
Lease renewal term end year	10 years	10 years