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Results of Operations for Former PSI Facilities Reflected as Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Acquisitions And Discontinued Operations [Line Items]      
Net revenues $ 7,813 $ 95,226 $ 159,218
Income (loss) from discontinued operations, before income taxes 932 (3,472) 10,422
Gain on divestiture 3,080 26,419 442
Income from discontinued operations, before income tax expense 4,012 22,947 10,864
Income tax expense (1,506) (8,688) (4,113)
Income from discontinued operations, net of income taxes $ 2,506 $ 14,259 $ 6,751