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Leases - Summary of Maturities of Operating Lease Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Operating Lease Liabilities Payments Due [Abstract]    
2019   $ 254,866
2019 $ 38,917  
2020 213,328 188,138
2021 185,398 165,642
2022 164,980 144,814
2023 141,834 122,814
Thereafter 898,859 $ 819,004
Total undiscounted operating lease payments 1,643,316  
Less: Imputed interest (430,850)  
Total operating lease liabilities $ 1,212,466