Leases - Schedule of Supplemental Information Related to Operating Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Operating lease ROU assets	$ 157,756	$ 169,065
Operating lease, right-of-use asset [extensible list]	us-gaap:OtherAssets	us-gaap:OtherAssets
Liabilities
Operating lease liabilities	$ 179,719	$ 187,398
Operating lease, liability [extensible list]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent