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Fair Value of Financial Instruments - Schedule of Investment in Nonconsolidated Affiliates Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
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Jun. 30, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | |||
| Investment in nonconsolidated affiliate | $ 2.9 | $ 6.4 | |
| Investment in nonconsolidated affiliate | 2.9 | ||
| Total Losses | 1.5 | 0.3 | 4.6 |
| Significant Unobservable Inputs (Level 3) [Member] | |||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | |||
| Investment in nonconsolidated affiliate | $ 2.9 | $ 6.4 | |