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Pension Plan - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Compensation And Retirement Disclosure [Abstract]  
Minimum required pension plan contribution $ 3.7
Partial credit balance utilized for minimum required contribution 23.6
Contribution of Pension Fund 2.5
Additional expected Contribution of pension fund $ 2.5