Adoption of ASC 842 - Summary of Components of Lease Expense, Supplemental Cash Flow Information Related to Leases and Other Lease-related Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Components of lease expense:
Operating lease cost	$ 1,848
Short-term lease cost	705
Other cost	18
Total lease cost	2,571
Supplemental cash flow information related to leases:
Operating cash flows from operating leases	1,799
Operating cash flows from finance leases	4
Financing cash flows from finance leases	36
Cash paid for amounts included in the measurement of lease liabilities	1,839
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 938
Other lease-related information:
Weighted-average remaining lease term - operating leases (in years)	4 years 3 months 18 days
Weighted-average remaining lease term - finance leases (in years)	4 years 6 months
Weighted-average discount rate - operating leases	8.96%
Weighted-average discount rate - finance leases	8.94%