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, 2018	Mar. 31, 2017
Operating activities:
Net income (loss)	$ 50,874	$ 34,773
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:
Depreciation and amortization	39,773	33,613
Amortization of debt issuance costs	2,525	2,396
Equity-based compensation expense	6,919	7,396
Deferred income tax (benefit) expense	1,897	2,007
Debt extinguishment costs	940
Other	1,043	3,825
Change in operating assets and liabilities:
Accounts receivable, net	(18,793)	(12,459)
Other current assets	(13,216)	5,886
Other assets	(1,268)	(1,710)
Accounts payable and other accrued liabilities	(3,368)	(16,993)
Accrued salaries and benefits	4,802	(3,437)
Other liabilities	509	2,142
Net cash provided by continuing operating activities	72,637	57,439
Net cash used in discontinued operating activities	(287)	(425)
Net cash (used in) provided by operating activities	72,350	57,014
Investing activities:
Cash paid for capital expenditures	(70,327)	(50,549)
Cash paid for real estate acquisitions	(4,293)	(2,495)
Other	(4,066)	(5,051)
Net cash used in investing activities	(78,686)	(58,095)
Financing activities:
Principal payments on long-term debt		(8,638)
Common stock withheld for minimum statutory taxes, net	(2,030)	(4,234)
Other	(2,704)	(865)
Net cash used in financing activities	(4,734)	(13,737)
Effect of exchange rate changes on cash	1,588	842
Net (decrease) increase in cash and cash equivalents	(9,482)	(13,976)
Cash and cash equivalents at beginning of the period	67,290	57,063
Cash and cash equivalents at end of the period	57,808	43,087
Consolidating Adjustments [Member]
Operating activities:
Net income (loss)	(67,598)	(46,553)
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:
Equity in earnings of subsidiaries	67,598	46,553
Change in operating assets and liabilities:
Other assets	(4,432)	(2,927)
Net cash provided by continuing operating activities	(4,432)	(2,927)
Net cash (used in) provided by operating activities	(4,432)	(2,927)
Financing activities:
Principal payments on long-term debt	4,432	2,927
Net cash used in financing activities	4,432	2,927
Parent [Member]
Operating activities:
Net income (loss)	50,874	34,773
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:
Equity in earnings of subsidiaries	(67,598)	(46,553)
Amortization of debt issuance costs	2,626	2,500
Equity-based compensation expense	6,919	7,396
Deferred income tax (benefit) expense	942	(171)
Debt extinguishment costs	940
Other	794	2,732
Change in operating assets and liabilities:
Other assets	4,432	2,927
Net cash provided by continuing operating activities	(71)	3,604
Net cash (used in) provided by operating activities	(71)	3,604
Financing activities:
Principal payments on long-term debt		(8,638)
Common stock withheld for minimum statutory taxes, net	(2,030)	(4,234)
Other	(1,742)
Cash provided by (used in) intercompany activity	3,843	9,268
Net cash used in financing activities	71	(3,604)
Combined Subsidiary Guarantors [Member]
Operating activities:
Net income (loss)	43,539	32,383
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:
Depreciation and amortization	18,172	15,551
Deferred income tax (benefit) expense	1,104	2,754
Other	315	506
Change in operating assets and liabilities:
Accounts receivable, net	(21,049)	(10,412)
Other current assets	(7,980)	5,097
Other assets	(1,305)	(1,778)
Accounts payable and other accrued liabilities	(11,417)	(9,224)
Accrued salaries and benefits	5,208	(1,961)
Other liabilities	1,204	(304)
Net cash provided by continuing operating activities	27,791	32,612
Net cash used in discontinued operating activities	(287)	(425)
Net cash (used in) provided by operating activities	27,504	32,187
Investing activities:
Cash paid for capital expenditures	(40,879)	(30,018)
Cash paid for real estate acquisitions	(4,293)	(2,495)
Other	(4,799)	(6,531)
Net cash used in investing activities	(49,971)	(39,044)
Financing activities:
Principal payments on long-term debt	(169)
Other	(962)	(865)
Cash provided by (used in) intercompany activity	1,950	(5,030)
Net cash used in financing activities	819	(5,895)
Net (decrease) increase in cash and cash equivalents	(21,648)	(12,752)
Cash and cash equivalents at beginning of the period	46,860	15,681
Cash and cash equivalents at end of the period	25,212	2,929
Combined Non-Guarantors [Member]
Operating activities:
Net income (loss)	24,059	14,170
Adjustments to reconcile net income (loss) to net cash (used in) provided by continuing operating activities:
Depreciation and amortization	21,601	18,062
Amortization of debt issuance costs	(101)	(104)
Deferred income tax (benefit) expense	(149)	(576)
Other	(66)	587
Change in operating assets and liabilities:
Accounts receivable, net	2,256	(2,047)
Other current assets	(5,236)	789
Other assets	37	68
Accounts payable and other accrued liabilities	8,049	(7,769)
Accrued salaries and benefits	(406)	(1,476)
Other liabilities	(695)	2,446
Net cash provided by continuing operating activities	49,349	24,150
Net cash (used in) provided by operating activities	49,349	24,150
Investing activities:
Cash paid for capital expenditures	(29,448)	(20,531)
Other	733	1,480
Net cash used in investing activities	(28,715)	(19,051)
Financing activities:
Principal payments on long-term debt	(4,263)	(2,927)
Cash provided by (used in) intercompany activity	(5,793)	(4,238)
Net cash used in financing activities	(10,056)	(7,165)
Effect of exchange rate changes on cash	1,588	842
Net (decrease) increase in cash and cash equivalents	12,166	(1,224)
Cash and cash equivalents at beginning of the period	20,430	41,382
Cash and cash equivalents at end of the period	$ 32,596	$ 40,158