Financial Information for the Company and Its Subsidiaries - Summary of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income (loss)	$ 34,067	$ 29,511
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	41,680	40,580
Amortization of debt issuance costs	3,050	2,888
Equity-based compensation expense	4,979	6,101
Deferred income taxes	11,286	(666)
Other	(107)	2,187
Change in operating assets and liabilities:
Accounts receivable, net	(2,828)	(11,980)
Other current assets	(19,131)	(5,875)
Other assets	(1,096)	295
Accounts payable and other accrued liabilities	(21,755)	(15,701)
Accrued salaries and benefits	(6,030)	(5,849)
Other liabilities	1,431	2,182
Net cash provided by operating activities	45,546	43,673
Investing activities:
Cash paid for acquisitions, net of cash acquired		(40,400)
Cash paid for capital expenditures	(69,547)	(69,248)
Cash paid for real estate acquisitions	(3,149)	(1,066)
Proceeds from sale of property and equipment	207	928
Other	(1,672)	(315)
Net cash used in investing activities	(74,161)	(110,101)
Financing activities:
Borrowings on revolving credit facility		71,573
Principal payments on long-term debt	(10,621)	(8,246)
Common stock withheld for minimum statutory taxes, net	(1,402)	(1,327)
Distributions to noncontrolling interests	(264)
Other	(1,143)	(3,497)
Net cash (used in) provided by financing activities	(13,430)	58,503
Effect of exchange rate changes on cash	(1,143)	1,099
Net decrease in cash and cash equivalents	(43,188)	(6,826)
Cash and cash equivalents at beginning of the period	124,192	50,510
Cash and cash equivalents at end of the period	81,004	43,684
Parent [Member]
Operating activities:
Net income (loss)	34,067	29,511
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Equity in earnings of subsidiaries	(48,353)	(48,157)
Amortization of debt issuance costs	3,050	2,888
Equity-based compensation expense	4,979	6,101
Deferred income taxes	101	(254)
Other	(101)	1,993
Change in operating assets and liabilities:
Other assets	82	2,665
Net cash provided by operating activities	(6,175)	(5,253)
Financing activities:
Borrowings on revolving credit facility		71,573
Principal payments on long-term debt	(10,621)	(8,246)
Common stock withheld for minimum statutory taxes, net	(1,402)	(1,327)
Other		(2,375)
Cash provided by (used in) intercompany activity	18,198	(54,372)
Net cash (used in) provided by financing activities	6,175	5,253
Combined Subsidiary Guarantors [Member]
Operating activities:
Net income (loss)	32,448	29,425
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	21,046	19,605
Deferred income taxes	11,044	(678)
Other	(9)	253
Change in operating assets and liabilities:
Accounts receivable, net	(5,234)	(15,693)
Other current assets	(17,887)	(5,484)
Other assets	(1,593)	(353)
Accounts payable and other accrued liabilities	17,726	(7,100)
Accrued salaries and benefits	(7,411)	(7,872)
Other liabilities	2,803	3,317
Net cash provided by operating activities	52,933	15,420
Investing activities:
Cash paid for acquisitions, net of cash acquired		(40,400)
Cash paid for capital expenditures	(48,264)	(45,231)
Cash paid for real estate acquisitions	(3,149)	(1,066)
Proceeds from sale of property and equipment	207	836
Other	(1,672)	(315)
Net cash used in investing activities	(52,878)	(86,176)
Financing activities:
Other	(423)	(442)
Cash provided by (used in) intercompany activity	(47,235)	56,570
Net cash (used in) provided by financing activities	(47,658)	56,128
Net decrease in cash and cash equivalents	(47,603)	(14,628)
Cash and cash equivalents at beginning of the period	98,943	32,471
Cash and cash equivalents at end of the period	51,340	17,843
Combined Non-Guarantors [Member]
Operating activities:
Net income (loss)	15,905	18,732
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	20,634	20,975
Deferred income taxes	141	266
Other	3	(59)
Change in operating assets and liabilities:
Accounts receivable, net	2,406	3,713
Other current assets	(1,244)	(391)
Other assets	497	648
Accounts payable and other accrued liabilities	(39,481)	(8,601)
Accrued salaries and benefits	1,381	2,023
Other liabilities	(1,372)	(1,135)
Net cash provided by operating activities	(1,130)	36,171
Investing activities:
Cash paid for capital expenditures	(21,283)	(24,017)
Proceeds from sale of property and equipment		92
Net cash used in investing activities	(21,283)	(23,925)
Financing activities:
Principal payments on long-term debt	(82)	(2,665)
Distributions to noncontrolling interests	(264)
Other	(720)	(680)
Cash provided by (used in) intercompany activity	29,037	(2,198)
Net cash (used in) provided by financing activities	27,971	(5,543)
Effect of exchange rate changes on cash	(1,143)	1,099
Net decrease in cash and cash equivalents	4,415	7,802
Cash and cash equivalents at beginning of the period	25,249	18,039
Cash and cash equivalents at end of the period	29,664	25,841
Consolidating Adjustments [Member]
Operating activities:
Net income (loss)	(48,353)	(48,157)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Equity in earnings of subsidiaries	48,353	48,157
Change in operating assets and liabilities:
Other assets	(82)	(2,665)
Net cash provided by operating activities	(82)	(2,665)
Financing activities:
Principal payments on long-term debt	82	2,665
Net cash (used in) provided by financing activities	$ 82	$ 2,665