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Leases - Schedule of Components of Lease Costs (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lease Cost [Line Items]    
Amortization costs $ 8,041 $ 22,328
Variable lease costs 20,582 53,634
Cost of Services [Member]    
Lease Cost [Line Items]    
Amortization costs 6,600 18,200
Variable lease costs 4,800 11,700
Depreciation and Amortization [Member]    
Lease Cost [Line Items]    
Amortization costs 1,400 4,100
Operating, Administrative and Other Costs [Member]    
Lease Cost [Line Items]    
Variable lease costs $ 15,800 $ 41,900