Leases - Summary of Lease Cost and Other Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Finance lease cost:
Amortization of right-of-use assets	$ 3,195	$ 8,840
Interest on lease liabilities	831	2,617
Operating lease cost (includes variable and sublease costs as they are immaterial)	5,993	16,481
Short-term lease cost	1,221	3,674
Total lease cost	11,240	31,612
Other Information
Right-of-use assets obtained in exchange for new finance lease liabilities	1,107	6,165
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 38,355	$ 43,622