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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Income Tax Disclosure [Abstract]          
Total deferred tax valuation allowance $ 141,200,000   $ 141,200,000   $ 82,500,000
Effective tax provision 1,116,000 (20,087,000) 3,190,000 (55,964,000)  
Increase in deferred tax valuation allowance     58,700,000    
Effective tax rate 2.50% (36.50%) 2.70% (43.60%)  
Cumulative effect of federal and state valuation losses     39.30%    
Decrease in unrecognized tax positions 1,900,000   1,900,000    
Possible interest and accrued penalties $ 2,300,000   $ 2,300,000