Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Summary of Income Tax Expense and Effective Tax Rate (Detail)

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Income Taxes - Summary of Income Tax Expense and Effective Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Disclosure [Abstract]        
Income tax expense $ 12,232 $ 4,632 $ 23,669 $ 6,910
Effective tax rate 24.20% 34.40% 24.90% 29.60%