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Consolidated Quarterly Financial Data (unaudited) - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2010
Business acquisition, cost of acquired entity, transaction costs $ 500,000     $ 500,000     $ 2,400,000 $ 13,600,000 $ 1,700,000  
Warrants not settleable in cash, fair value disclosure   1,900,000 126,800,000             3,300,000
Dividends, preferred stock, stock   1,300,000 2,000,000              
Loss on early extinguishment of preferred stock   22,100,000                
Reversal of income tax valuation allowance against net deferred tax assets $ 59,887,000     $ (59,887,000) $ 0 $ 0