Leases - Schedule of Lease Costs and Classification on Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Lease Cost
Net lease cost	$ 4,380	$ 7,499
Operating Expense [Member]
Lessee Lease Description [Line Items]
Operating lease cost	4,023	6,781
Selling, General and Administrative Expenses [Member]
Lessee Lease Description [Line Items]
Operating lease cost	136	273
Depreciation and Amortization [Member]
Financing lease cost
Amortization of leased assets	184	368
Interest Expense [Member]
Financing lease cost
Interest on lease liabilities	$ 37	$ 77