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Segment Information - Summary of Reconciliation of Segment EBITDA to Income before Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Revenue $ 833,304 $ 777,251 $ 2,366,425 $ 2,327,230
Segment EBITDA 159,405 146,638 436,675 441,527
Equity-based compensation expense (5,471) (4,039) (16,258) (14,322)
Transaction-related expenses (8,503) (5,775) (17,293) (15,308)
Loss on impairment (20,239)   (20,239)  
Debt extinguishment costs     (3,271)  
Interest expense, net (37,553) (46,644) (119,064) (143,384)
Depreciation and amortization (42,912) (40,620) (126,037) (122,277)
Income before income taxes 44,727 49,560 134,513 146,236
U.S. Facilities [Member]        
Segment Reporting Information [Line Items]        
Revenue 547,961 509,383 1,548,653 1,507,156
U.S. Facilities [Member] | Operating Segment [Member]        
Segment Reporting Information [Line Items]        
Revenue 547,961 509,383 1,548,653 1,507,156
Segment EBITDA 138,401 127,087 393,356 381,491
U.K. Facilities [Member]        
Segment Reporting Information [Line Items]        
Revenue 285,343 267,868 817,772 820,074
U.K. Facilities [Member] | Operating Segment [Member]        
Segment Reporting Information [Line Items]        
Revenue 285,343 267,868 817,772 820,074
Segment EBITDA 43,388 40,726 111,195 126,617
Corporate and Other [Member] | Corporate Reconciling Items and Eliminations [Member]        
Segment Reporting Information [Line Items]        
Segment EBITDA $ (22,384) $ (21,175) $ (67,876) $ (66,581)