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Debt - Principal Payments on, and Estimated Amortization on Debt (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2013
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| Debt Instrument [Line Items] | |
| Rate of cash premium | 10.00% |
| Debentures repaid | $ 27.5 |
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Secured borrowings [Member]
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| Debt Instrument [Line Items] | |
| Rate of cash premium | 10.00% |