Leases - Components of Lease Cost and Other Lease (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease cost:
Operating lease cost	$ 3,769
Short-term lease cost	814
Variable lease cost	311
Total lease cost	4,894
Other information:
Cash paid for amounts included in the measurement of operating lease liabilities	3,861
ROU assets obtained in exchange for new operating lease liabilities	$ 1,017
Weighted-average remaining lease term in years – operating leases	10 years 7 months 6 days
Weighted-average discount rate – operating leases	6.00%