Leases - Schedule of Lease Cost and Other Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Lease Cost
Operating lease cost	$ 3,101	$ 8,583
Short-term lease cost	1,105	3,488
Variable lease cost	203	802
Total lease cost	4,409	12,873
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flow from operating leases	3,124	8,658
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 3,666	$ 5,160