Quarterly report pursuant to Section 13 or 15(d)

Pension Plans - Additional Information (Detail)

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Pension Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit pension plan contributed $ 8.4
Defined benefit pension plan anticipated during the remainder of 2012 $ 7.5