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Components of Operating Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Lease cost $ 17,984 $ 35,760
Short-term lease cost 2,433 4,609
Variable lease cost 109 315
Sublease income (32) (81)
Total operating lease cost $ 20,494 $ 40,603