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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]        
Income tax expense $ 9,112,000 $ 6,695,000 $ 18,841,000 $ 31,155,000
Reduction in pre-tax earnings (loss) 17,230,000 17,526,000 35,905,000 88,420,000
Proceeds from income tax refunds     22,400,000  
Interest from income tax refunds     $ 2,200,000