Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Taxes [Line Items]        
Effective income tax rate 40.50% 40.90% 40.90% 41.10%
Estimated 2015 annual effective tax rate [Member]        
Income Taxes [Line Items]        
Effective income tax rate     40.70%