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, 2014
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]          
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions   $ 6,100,000      
Income tax expense $ 11,014,000   $ 9,112,000 $ 14,093,000 $ 18,841,000