Acquisitions - Priory Acquisition (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 2,832,201	$ 2,128,215
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Cash	12,741
Accounts receivable	62,121
Prepaid expenses and other current assets	7,996
Property and equipment	1,638,706
Goodwill	764,189
Intangible assets	23,404
Other assets	7,807
Total assets acquired	2,516,964
Accounts payable	25,008
Accrued salaries and benefits	40,348
Other accrued expenses	47,309
Deferred tax liabilities - noncurrent	67,598
Long-term debt	1,348,389
Other liabilities	75,404
Total liabilities assumed	1,604,056
Net assets acquired	912,908
Priory [Member] | 2016 Acquisitions [Member]
Business Acquisition [Line Items]
Cash	10,253
Accounts receivable	57,832
Prepaid expenses and other current assets	7,921
Property and equipment	1,603,306
Goodwill	668,915
Intangible assets	23,200
Other assets	7,760
Total assets acquired	2,379,187
Accounts payable	24,203
Accrued salaries and benefits	39,588
Other accrued expenses	47,016
Deferred tax liabilities - noncurrent	67,598
Long-term debt	1,348,389
Other liabilities	45,162
Total liabilities assumed	1,571,956
Net assets acquired	807,231
Other [Member] | 2016 Acquisitions [Member]
Business Acquisition [Line Items]
Cash	2,488
Accounts receivable	4,289
Prepaid expenses and other current assets	75
Property and equipment	35,400
Goodwill	95,274
Intangible assets	204
Other assets	47
Total assets acquired	137,777
Accounts payable	805
Accrued salaries and benefits	760
Other accrued expenses	293
Other liabilities	30,242
Total liabilities assumed	32,100
Net assets acquired	$ 105,677