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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Disclosure [Abstract]        
Income tax expense $ 11,233,000 $ 9,817,000 $ 9,729,000 $ 24,460,000
Reduction in pre-tax earnings (loss) 19,607,000 29,925,000 18,675,000 70,894,000
Acquisition-related transaction costs, tax expense 1,900,000      
Tax benefit, prior period returns filed during the quarter 600,000      
Proceeds from income tax refunds 21,300,000      
Interest from income tax refunds $ 2,200,000