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Leases - Schedule of Components of Lease Costs (Parenthetical) (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Lease Cost [Line Items]  
Amortization costs $ 7,169
Variable lease costs 16,947
Cost of Services [Member]  
Lease Cost [Line Items]  
Amortization costs 5,900
Variable lease costs 3,100
Depreciation and Amortization [Member]  
Lease Cost [Line Items]  
Amortization costs 1,300
Operating, Administrative and Other Costs [Member]  
Lease Cost [Line Items]  
Variable lease costs $ 13,800