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Borrowings - Additional Information (Detail) (USD $)
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0 Months Ended | 9 Months Ended | 0 Months Ended | ||||||
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Sep. 30, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Apr. 07, 2014
5.000% Notes
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Sep. 30, 2014
5.000% Notes
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Apr. 07, 2014
5.000% Notes
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May 29, 2014
Credit Facility
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Sep. 30, 2014
Credit Facility
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May 29, 2014
Credit Facility
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| Debt Instrument [Line Items] | |||||||||
| Senior notes issued | $ 600,000,000 | $ 500,000,000 | $ 500,000,000 | ||||||
| Debt instrument, interest rate | 5.00% | 5.00% | |||||||
| Debt instrument, maturity date | Jun. 15, 2044 | Jun. 15, 2044 | |||||||
| Interest rate, payment terms | Interest is payable semiannually in arrears on June 15 and December 15 of each year, commencing December 15, 2014. | ||||||||
| Interest payment commencement date | Dec. 15, 2014 | ||||||||
| Credit facility, maximum borrowing capacity | 1,100,000,000 | ||||||||
| Debt instrument, maturity date description | The amendment, among other things, extended the maturity date of the Credit Facility from July 13, 2017 to May 29, 2019. | ||||||||
| Line of credit expiration date | May 29, 2019 | ||||||||
| Outstanding borrowings | 0 | ||||||||
| Fair value of the CLO assets | $ 7,500,000,000 | $ 9,500,000,000 |