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Leases - Schedule of Components of Lease Costs (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Finance lease cost:  
Amortization of right-to-use assets $ 7,169
Variable lease cost 16,947
Total lease cost 70,808
Operating, administrative and other costs [Member]  
Lease Cost [Line Items]  
Operating lease cost 46,728
Interest expense [Member]  
Finance lease cost:  
Interest on lease liabilities 204
Revenue [Member]  
Finance lease cost:  
Sublease income $ (240)