Leases - Summary of Lease Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 73,211	$ 69,100
Short-term operating lease liabilities	$ 11,900
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent
Non-current operating lease liabilities	$ 72,940	$ 67,062
Total operating lease liabilities	$ 84,840