Quarterly report pursuant to Section 13 or 15(d)

Accounting for Uncertainty in Income Taxes - Additional Information (Detail)

v2.4.0.8
Accounting for Uncertainty in Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
Liability for unrecognized tax   $ 8.2   $ 10.5
Unrecognized tax favorable impact on effective tax rate   3.6   3.8
Accrued interest and penalties applied to uncertain tax positions   3.1 7.9  
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions $ 6.1