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Pension Plans - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2013
Dec. 31, 2012
Compensation And Retirement Disclosure [Abstract]      
Non-cash curtailment gain $ 6,300,000    
Pension liability     6,300,000
Contribution to pension plan   1,600,000  
Contributions made by the entity   $ 0