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Summary of Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Short-term Debt
    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Notional Amount   $ 0.3
Fair Value   0.3
Long-term Debt
    
Carrying Amounts and Fair Values of Financial Instruments [Line Items]    
Notional Amount 160.6 [1] 157.5 [1]
Fair Value $ 160.6 [1] $ 208.2 [1]
[1] Long-term debt includes current portions of long-term debt and current portions of capital lease obligations of $6.1 million and $4.7 million as of March 31, 2013 and December 31, 2012, respectively.