Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 52,802	$ 52,183
Restricted cash	21,335
Accounts receivable, net of allowance	270,597	254,188
Prepaid expenses and other current assets	28,791	21,119
Total current assets	373,525	327,490
Real estate and related assets:
Property and equipment, net	2,830,589	2,546,844
Other real estate assets	247,223	255,605
Goodwill	48,169	40,927
Non-current deferred tax assets	14,947	12,814
Other assets	141,207	88,718
Total assets	3,655,660	3,272,398
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	350,087	277,804
Income taxes payable	2,188	3,034
Current portion of long-term debt	14,121	10,000
Total current liabilities	366,396	290,838
Long-term debt, net	1,787,555	1,437,187
Deferred revenue	26,102	39,735
Other liabilities	60,548	53,030
Total liabilities	2,240,601	1,820,790
Total stockholders' equity	1,415,059	1,451,608	$ 1,458,963	$ 1,462,748
Total liabilities and stockholders' equity	3,655,660	3,272,398
Reportable Legal Entities | Parent
ASSETS
Cash and cash equivalents	11,109	25,745
Accounts receivable, net of allowance	254,766	211,673
Prepaid expenses and other current assets	4,412	1,835
Total current assets	270,287	239,253
Real estate and related assets:
Property and equipment, net	2,255,361	2,211,561
Other real estate assets	247,223	255,605
Goodwill	33,057	26,031
Non-current deferred tax assets	727
Other assets	507,161	421,474
Total assets	3,313,816	3,153,924
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	293,165	251,011
Income taxes payable	1,309	1,443
Current portion of long-term debt	8,720	10,000
Total current liabilities	303,194	262,454
Long-term debt, net	1,579,273	1,437,982
Non-current deferred tax liabilities	1,165	379
Other liabilities	15,125	1,501
Total liabilities	1,898,757	1,702,316
Total stockholders' equity	1,415,059	1,451,608
Total liabilities and stockholders' equity	3,313,816	3,153,924
Reportable Legal Entities | Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	40,348	26,438
Accounts receivable, net of allowance	445,105	372,755
Prepaid expenses and other current assets	26,939	24,986
Total current assets	512,392	424,179
Real estate and related assets:
Property and equipment, net	310,989	335,283
Goodwill	15,112	14,896
Non-current deferred tax assets	14,220	13,193
Other assets	61,104	69,117
Total assets	913,817	856,668
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	376,833	362,701
Income taxes payable	866	1,591
Total current liabilities	377,699	364,292
Long-term debt, net	114,428	114,205
Deferred revenue	26,102	39,735
Other liabilities	45,423	51,529
Total liabilities	563,652	569,761
Total stockholders' equity	350,165	286,907
Total liabilities and stockholders' equity	913,817	856,668
Reportable Legal Entities | Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	1,345
Restricted cash	21,335
Accounts receivable, net of allowance	1,809
Prepaid expenses and other current assets	1,951
Total current assets	26,440
Real estate and related assets:
Property and equipment, net	264,239
Non-current deferred tax assets	1,165
Other assets	38,112
Total assets	329,956
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	115,648
Income taxes payable	13
Current portion of long-term debt	5,401
Total current liabilities	121,062
Long-term debt, net	208,854
Total liabilities	329,916
Total stockholders' equity	40
Total liabilities and stockholders' equity	329,956
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(431,083)	(330,240)
Prepaid expenses and other current assets	(4,511)	(5,702)
Total current assets	(435,594)	(335,942)
Real estate and related assets:
Non-current deferred tax assets	(1,165)	(379)
Other assets	(465,170)	(401,873)
Total assets	(901,929)	(738,194)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(435,559)	(335,908)
Total current liabilities	(435,559)	(335,908)
Long-term debt, net	(115,000)	(115,000)
Non-current deferred tax liabilities	(1,165)	(379)
Total liabilities	(551,724)	(451,287)
Total stockholders' equity	(350,205)	(286,907)
Total liabilities and stockholders' equity	$ (901,929)	$ (738,194)