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Employee Benefit Plans - Additional Information (Detail) (Pension and Other Postretirement Benefit Plans [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2015
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Pension and Other Postretirement Benefit Plans [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Current contribution amount | $ 6.8 |
| Additional contribution amount for remaining fiscal period | $ 10.3 |