Leases - Schedule of Supplemental Information Related to Operating Leases (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Assets
Operating lease, right-of-use asset	$ 190,219
Operating lease, right-of-use asset [extensible list]	us-gaap:OtherAssets
Liabilities
Operating lease, liability	$ 204,889
Operating lease, liability [extensible list]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent