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Financial Information for the Company and Its Subsidiaries - Summary of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Operating activities:        
Net income (loss) $ 48,201 $ 58,890 $ 77,712 $ 109,764
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:        
Depreciation and amortization 41,077 39,928 81,657 79,701
Amortization of debt issuance costs     5,887 5,124
Equity-based compensation expense 4,182 7,129 10,283 14,048
Deferred income taxes     (205) (3,978)
Debt extinguishment costs       940
Other     2,395 1,040
Change in operating assets and liabilities:        
Accounts receivable, net     (27,669) (26,104)
Other current assets     (10,591) 9,953
Other assets     661 2,761
Accounts payable and other accrued liabilities     (11,060) 21,066
Accrued salaries and benefits     (3,232) 4,364
Other liabilities     2,848 (793)
Net cash provided by continuing operating activities     128,686 217,886
Net cash used in discontinued operating activities       (572)
Net cash provided by operating activities     128,686 217,314
Investing activities:        
Cash paid for acquisitions, net of cash acquired     (44,900)  
Cash paid for capital expenditures     (139,128) (161,555)
Cash paid for real estate acquisitions     (4,448) (8,857)
Other     10,494 (3,337)
Net cash used in investing activities     (177,982) (173,749)
Financing activities:        
Borrowings on revolving credit facility     76,573  
Principal payments on revolving credit facility     (11,573)  
Principal payments on long-term debt     (16,492) (23,246)
Common stock withheld for minimum statutory taxes, net     (1,615) (2,134)
Other     (4,345) (5,172)
Net cash provided by (used in) financing activities     42,548 (30,552)
Effect of exchange rate changes on cash     (221) (840)
Net (decrease) increase in cash and cash equivalents     (6,969) 12,173
Cash and cash equivalents at beginning of the period     50,510 67,290
Cash and cash equivalents at end of the period 43,541 79,463 43,541 79,463
Consolidating Adjustments [Member]        
Operating activities:        
Net income (loss) (65,884) (75,752) (114,041) (143,350)
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:        
Equity in earnings of subsidiaries 65,884 75,752 114,041 143,350
Change in operating assets and liabilities:        
Other assets     (3,097) (4,514)
Net cash provided by continuing operating activities       (4,514)
Net cash provided by operating activities     (3,097) (4,514)
Financing activities:        
Principal payments on long-term debt     3,097 4,514
Net cash provided by (used in) financing activities     3,097 4,514
Parent [Member]        
Operating activities:        
Net income (loss) 48,201 58,890 77,712 109,764
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:        
Equity in earnings of subsidiaries (65,884) (75,752) (114,041) (143,350)
Amortization of debt issuance costs     5,887 5,326
Equity-based compensation expense     10,283 14,048
Deferred income taxes     (198) 1,438
Debt extinguishment costs       940
Other     2,126 240
Change in operating assets and liabilities:        
Other assets     3,097 4,514
Net cash provided by continuing operating activities       (7,080)
Net cash provided by operating activities     (15,134) (7,080)
Financing activities:        
Borrowings on revolving credit facility     76,573  
Principal payments on revolving credit facility     (11,573)  
Principal payments on long-term debt     (16,492) (23,246)
Common stock withheld for minimum statutory taxes, net     (1,615) (2,134)
Other     (2,375) (1,742)
Cash (used in) provided by intercompany activity     (29,384) 34,202
Net cash provided by (used in) financing activities     15,134 7,080
Combined Subsidiary Guarantors [Member]        
Operating activities:        
Net income (loss) 35,562 49,919 64,987 93,458
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:        
Depreciation and amortization 20,017 18,611 39,622 36,783
Deferred income taxes     (73) (5,843)
Other     321 1,149
Change in operating assets and liabilities:        
Accounts receivable, net     (24,767) (23,064)
Other current assets     (11,029) 12,197
Other assets     (714) 2,689
Accounts payable and other accrued liabilities     942 27,859
Accrued salaries and benefits     (4,628) 4,487
Other liabilities     5,558 3,002
Net cash provided by continuing operating activities       152,717
Net cash used in discontinued operating activities       (572)
Net cash provided by operating activities     70,219 152,145
Investing activities:        
Cash paid for acquisitions, net of cash acquired     (44,900)  
Cash paid for capital expenditures     (93,952) (97,186)
Cash paid for real estate acquisitions     (4,448) (8,857)
Other     6,402 (5,759)
Net cash used in investing activities     (136,898) (111,802)
Financing activities:        
Principal payments on long-term debt       (169)
Other     (889) (1,924)
Cash (used in) provided by intercompany activity     65,361 (25,131)
Net cash provided by (used in) financing activities     64,472 (27,224)
Net (decrease) increase in cash and cash equivalents     (2,207) 13,119
Cash and cash equivalents at beginning of the period     32,471 46,860
Cash and cash equivalents at end of the period 30,264 59,979 30,264 59,979
Combined Non-Guarantors [Member]        
Operating activities:        
Net income (loss) 30,322 25,833 49,054 49,892
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:        
Depreciation and amortization 21,060 21,317 42,035 42,918
Amortization of debt issuance costs       (202)
Deferred income taxes     66 427
Other     (52) (349)
Change in operating assets and liabilities:        
Accounts receivable, net     (2,902) (3,040)
Other current assets     438 (2,244)
Other assets     1,375 72
Accounts payable and other accrued liabilities     (12,002) (6,793)
Accrued salaries and benefits     1,396 (123)
Other liabilities     (2,710) (3,795)
Net cash provided by continuing operating activities       76,763
Net cash provided by operating activities     76,698 76,763
Investing activities:        
Cash paid for capital expenditures     (45,176) (64,369)
Other     4,092 2,422
Net cash used in investing activities     (41,084) (61,947)
Financing activities:        
Principal payments on long-term debt     (3,097) (4,345)
Other     (1,081) (1,506)
Cash (used in) provided by intercompany activity     (35,977) (9,071)
Net cash provided by (used in) financing activities     (40,155) (14,922)
Effect of exchange rate changes on cash     (221) (840)
Net (decrease) increase in cash and cash equivalents     (4,762) (946)
Cash and cash equivalents at beginning of the period     18,039 20,430
Cash and cash equivalents at end of the period $ 13,277 $ 19,484 $ 13,277 $ 19,484