Financial Information for the Company and Its Subsidiaries - Summary of Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 81,004	$ 124,192
Accounts receivable, net	339,505	339,775
Other current assets	82,443	78,244
Total current assets	502,952	542,211
Property and equipment, net	3,151,739	3,224,034
Goodwill	2,426,700	2,449,131
Intangible assets, net	89,052	90,357
Deferred tax assets	3,307	3,339
Operating lease right-of-use assets	476,028	501,837
Other assets	68,217	68,233
Total assets	6,717,995	6,879,142
Current liabilities:
Current portion of long-term debt	196,072	43,679
Accounts payable	134,693	127,045
Accrued salaries and benefits	114,790	122,552
Current portion of operating lease liabilities	29,671	29,140
Other accrued liabilities	104,358	141,160
Total current liabilities	579,584	463,576
Long-term debt	2,944,820	3,105,420
Deferred tax liabilities	85,405	71,860
Operating lease liabilities	474,746	502,252
Derivative instrument liabilities	9,015	68,915
Other liabilities	126,767	128,587
Total liabilities	4,220,337	4,340,610
Redeemable noncontrolling interests	33,491	33,151
Total equity	2,464,167	2,505,381	$ 2,420,691	$ 2,422,346	$ 2,403,343	$ 2,333,307
Total liabilities and equity	6,717,995	6,879,142
Parent [Member]
Current assets:
Deferred tax assets	1,303	1,403
Investment in subsidiaries	5,390,417	5,521,340
Other assets	234,014	233,975
Total assets	5,625,734	5,756,718
Current liabilities:
Current portion of long-term debt	196,072	43,679
Other accrued liabilities	11,660	33,323
Total current liabilities	207,732	77,002
Long-term debt	2,944,820	3,105,420
Derivative instrument liabilities	9,015	68,915
Total liabilities	3,161,567	3,251,337
Total equity	2,464,167	2,505,381
Total liabilities and equity	5,625,734	5,756,718
Combined Subsidiary Guarantors [Member]
Current assets:
Cash and cash equivalents	51,340	98,943
Accounts receivable, net	272,098	266,864
Other current assets	65,346	61,508
Total current assets	388,784	427,315
Property and equipment, net	1,348,045	1,313,830
Goodwill	1,992,332	1,992,344
Intangible assets, net	58,312	58,291
Operating lease right-of-use assets	98,166	97,396
Other assets	48,597	48,949
Total assets	3,934,236	3,938,125
Current liabilities:
Accounts payable	97,196	87,165
Accrued salaries and benefits	82,072	89,483
Current portion of operating lease liabilities	18,571	17,967
Other accrued liabilities	26,021	22,672
Total current liabilities	223,860	217,287
Deferred tax liabilities	41,087	21,858
Operating lease liabilities	85,577	85,365
Other liabilities	110,923	110,445
Total liabilities	461,447	434,955
Total equity	3,472,789	3,503,170
Total liabilities and equity	3,934,236	3,938,125
Combined Non-Guarantors [Member]
Current assets:
Cash and cash equivalents	29,664	25,249
Accounts receivable, net	67,407	72,911
Other current assets	17,097	16,736
Total current assets	114,168	114,896
Property and equipment, net	1,803,694	1,910,204
Goodwill	434,368	456,787
Intangible assets, net	30,740	32,066
Deferred tax assets	3,307	3,339
Operating lease right-of-use assets	377,862	404,441
Other assets	12,214	13,127
Total assets	2,776,353	2,934,860
Current liabilities:
Accounts payable	37,497	39,880
Accrued salaries and benefits	32,718	33,069
Current portion of operating lease liabilities	11,100	11,173
Other accrued liabilities	66,677	85,165
Total current liabilities	147,992	169,287
Long-term debt	226,608	227,818
Deferred tax liabilities	45,621	51,405
Operating lease liabilities	389,169	416,887
Other liabilities	15,844	18,142
Total liabilities	825,234	883,539
Redeemable noncontrolling interests	33,491	33,151
Total equity	1,917,628	2,018,170
Total liabilities and equity	2,776,353	2,934,860
Consolidating Adjustments [Member]
Current assets:
Deferred tax assets	(1,303)	(1,403)
Investment in subsidiaries	(5,390,417)	(5,521,340)
Other assets	(226,608)	(227,818)
Total assets	(5,618,328)	(5,750,561)
Current liabilities:
Long-term debt	(226,608)	(227,818)
Deferred tax liabilities	(1,303)	(1,403)
Total liabilities	(227,911)	(229,221)
Total equity	(5,390,417)	(5,521,340)
Total liabilities and equity	$ (5,618,328)	$ (5,750,561)