Quarterly report pursuant to Section 13 or 15(d)

Income Tax Benefit/Expense - Additional Information (Detail)

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Income Tax Benefit/Expense - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Tax Disclosure [Abstract]    
Income tax (benefit) expense $ (1,504,000) $ 14,643,000
Reduction in pre-tax earnings (loss) (932,000) 40,969,000
Tax benefit, settlement of the DOJ and SEC matter 1,500,000  
Acquisition-related transaction costs, tax expense 1,100,000  
Tax benefit, prior period returns filed during the quarter $ 700,000