Income Taxes - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Facility	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Income Taxes [Line Items]
Favorable discrete tax items	$ 1,000	$ 1,000	$ 1,000
Foreign pre-tax earnings	$ 41,000	15,000	6,000
Effective income tax rate, foreign	20.25%
Undistributed foreign earnings	$ 53,000
Unrecognizable deferred tax liability related to foreign earnings	8,000
Deferred federal and state tax benefit	42,000	17,000
Future taxable income, amount	1,080,000
Deferred state tax benefit (net of the federal benefit)	(302)	7,525	$ 3,278
Net operating losses	62,541	60,521
Deferred foreign tax benefit	5,545
Valuation allowances	52,567	52,764
Increase in estimated liabilities for uncertain tax positions	1,000	1,000
Decrease in estimated liabilities for uncertain tax positions due to the lapse of the statute of limitations	1,000
Impact of unrecognized tax benefits if recognized	$ 1,000	2,000
Period of expiration of the statute of limitations for certain jurisdictions	Within the next twelve months
Jurisdictions statutes of limitations expiration period	12 months
Maximum
Income Taxes [Line Items]
Accrued interest and penalties	$ 1,000	1,000
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years	4 years
Minimum
Income Taxes [Line Items]
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years	3 years
Allowance in relation to state tax benefit
Income Taxes [Line Items]
Valuation allowances	$ 51,000	50,000
Net Operating Losses
Income Taxes [Line Items]
Increase in valuation allowance	1,000
Foreign Net Operating Losses
Income Taxes [Line Items]
Increase in valuation allowance	2,000	$ 3,000
State and Local Jurisdiction
Income Taxes [Line Items]
Deferred state tax benefit (net of the federal benefit)	53,000
Foreign Tax Authority
Income Taxes [Line Items]
Net operating losses	$ 20,000
Behavioral Health Services
Income Taxes [Line Items]
Number of additional facilities acquired | Facility	5