Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Provision (benefit) for income taxes for continuing operations $ 10,569,000 $ 5,368,000 $ 27,722,000 $ 20,078,000
Effective income tax rate 43.09% 19.76% 41.55% 31.20%
Effective income tax rate, excluding bargain purchase gain and the merger and integration costs   42.63%   40.34%
Valuation allowance $ 0   $ 0