Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Future Minimum Lease Payments under Noncancellable Leases (Detail)

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Commitments and Contingencies - Future Minimum Lease Payments under Noncancellable Leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2018, Operating Leases $ 238,665
2019, Operating Leases 208,292
2020, Operating Leases 188,397
2021, Operating Leases 167,634
2022, Operating Leases 160,057
Thereafter, Operating leases 586,063
Total, Operating leases $ 1,549,108