Commitments and Contingencies - Schedule of Future Minimum Commitments for Leases (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Operating Leases, 2018	$ 224,630
Operating Leases, 2019	204,335
Operating Leases, 2020	175,612
Operating Leases, 2021	156,552
Operating Leases, 2022	130,802
Operating Leases, Thereafter	425,295
Operating Leases, Total minimum lease payments	1,317,226
Capital Leases, 2018	127,180
Capital Leases, 2019	137,313
Capital Leases, 2020	167,281
Capital Leases, 2021	138,042
Capital Leases, 2022	133,772
Capital Leases, Thereafter	81,627
Total minimum lease payments, Capital Leases	785,215
Less: Amounts representing interest not yet incurred, Capital Leases	99,181
Present value of capital lease obligations	686,034
Less: Current portion, Capital Leases	96,700
Long-term portion of capital lease obligations	$ 589,334