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Other Assets and Accounts Payable, Accrued Expenses and Other Liabilities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Schedule of Other Assets [Line Items] | |||
| Depreciation expense | $ 33.6 | $ 34.0 | $ 31.6 |
| Accounts Payable, Accrued Expenses and Other Liabilities for redemption to investors | 57.0 | 170.4 | |
| Payables relating to unsettled purchases | $ 229.1 | $ 352.3 | |