Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Changes in Liability Related to Unrecognized Tax Benefits (Parenthetical) (Detail)

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Income Taxes - Summary of Changes in Liability Related to Unrecognized Tax Benefits (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Unrecognized Tax Benefits [Line Items]        
Accrued interest and penalties $ 1.1 $ 2.4 $ 4.9 $ 5.1
State and Local Jurisdiction [Member]
       
Schedule Of Unrecognized Tax Benefits [Line Items]        
Net operating losses $ 1.0 $ 1.3 $ 3.5