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Interim Consolidated Financial Statements - Summary of Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 3,727 $ 7,296
Short-term lease cost 85 340
Variable lease cost 1,335 2,569
Total lease cost $ 5,147 $ 10,205