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Schedule II - Financial Statement Schedule Valuation and Qualifying Accounts (Parenthetical) (Detail) (Maximum [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2014
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Maximum [Member]
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| Valuation and Qualifying Accounts Disclosure [Line Items] | |
| Amounts written off, net of recoveries | $ 0.1 |