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Leases - Schedule of Components of Lease Costs (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Lease Cost [Line Items]    
Amortization costs $ 7,118 $ 14,287
Variable lease costs 16,106 33,053
Cost of Services [Member]    
Lease Cost [Line Items]    
Amortization costs 5,700 11,600
Variable lease costs 3,800 6,900
Depreciation and Amortization [Member]    
Lease Cost [Line Items]    
Amortization costs 1,400 2,700
Operating, Administrative and Other Costs [Member]    
Lease Cost [Line Items]    
Variable lease costs $ 12,300 $ 26,100