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Summary of Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 3,036,765 $ 2,627,602
Goodwill acquired during the period   445,661
Goodwill divested during the period   (19,352)
Adjustments to goodwill 12,251 [1] (17,146) [2]
Goodwill, Ending Balance 3,049,016 3,036,765
Acute Care Services
    
Goodwill [Line Items]    
Goodwill, Beginning Balance 382,696 389,484
Goodwill acquired during the period   11,110
Goodwill divested during the period   (17,450)
Adjustments to goodwill 315 [1] (448) [2]
Goodwill, Ending Balance 383,011 382,696
Behavioral Health Services
    
Goodwill [Line Items]    
Goodwill, Beginning Balance 2,654,069 2,238,118
Goodwill acquired during the period   434,551
Goodwill divested during the period   (1,902)
Adjustments to goodwill 11,936 [1] (16,698) [2]
Goodwill, Ending Balance $ 2,666,005 $ 2,654,069
[1] The increase in the Behavioral Health Services' goodwill consists primarily of an amount that was reclassified from other assets.
[2] The reduction to the Behavioral Health Services' goodwill consists primarily of a reclassification to "assets of facilities held for sale" and represents the goodwill attributable to Peak Behavioral Health Services which we agreed to divest pursuant to our agreement with the Federal Trade Commission in connection with our acquisition of Ascend Health Corporation in October, 2012. Adjustments to prior year purchase price allocations for Acute Care and Behavioral Health Services are also included.