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Subsequent Events (Details) (USD $) |  |  | 0 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 27 Months Ended |  |  |  | 0 Months Ended |
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Feb. 06, 2012 8% senior unsecured notes due 2018 [Member] Senior unsecured notes [Member] | Jan. 15, 2010 8% senior unsecured notes due 2018 [Member] Senior unsecured notes [Member] | Jul. 12, 2012 8% senior unsecured notes due 2018 [Member] Senior unsecured notes [Member] Issuance of Debt [Member] | Apr. 30, 2012 Depositary Units [Member] | Feb. 28, 2012 Depositary Units [Member] | Jul. 31, 2012 Depositary Units [Member] Dividend Declared [Member] | Jun. 30, 2012 Depositary Units [Member] Dividend Declared [Member] | Jul. 01, 2012 Investment Funds [Member] Investment [Domain] | Sep. 30, 2012 Federal-Mogul [Member] Amended Defined Benefits [Member] | Jun. 29, 2012 Saragon Co- Manager Agreements [Member] Immediate Family Member of Management or Principal Owner [Member] | Mar. 31, 2013 Saragon Co- Manager Agreements [Member] Immediate Family Member of Management or Principal Owner [Member] | Apr. 01, 2010 Saragon Co- Manager Agreements [Member] Immediate Family Member of Management or Principal Owner [Member] | Mar. 31, 2013 Saragon Co- Manager Agreements [Member] Immediate Family Member of Management or Principal Owner [Member] Co-Manager Agreements [Member] | Aug. 01, 2012 Saragon Co- Manager Agreements [Member] Immediate Family Member of Management or Principal Owner [Member] New Co-Manager Agreements [Member] | Aug. 01, 2012 Saragon Co- Manager Agreements [Member] Immediate Family Member of Management or Principal Owner [Member] Investment Funds [Member] New Co-Manager Agreements [Member] | Aug. 01, 2012 Saragon Co- Manager Agreements [Member] Immediate Family Member of Management or Principal Owner [Member] High River [Member] New Co-Manager Agreements [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt | $ 700,000,000 | $ 1,150,000,000 | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Registration Rights Agreement, days to file exchange offer after closing offering |  |  | 120 days |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Registration Rights Agreement, days for exchange offer registration statement to be declared effective after closing offering |  |  | 210 days |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Registration Rights Agreement, days to consumate exchange offer and issue exchange notes after declared effective |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of senior unsecured notes |  |  | 314,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, long-term debt |  | 8.00% | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution made to limited partner depositary unitholders, cash and depositary unit distributions declared, per unit |  |  |  | $ 0.35 | $ 0.35 | $ 0.35 |  |  |  |  |  |  |  |  |  |
Distribution made to limited partner depositary unitholders, cash distributions declared, per unit |  |  |  | $ 0.10 | $ 0.10 | $ 0.10 |  |  |  |  |  |  |  |  |  |
Distribution made to limited partner depositary unitholders, depositary unit distributions declared, per unit |  |  |  | $ 0.25 | $ 0.25 | $ 0.25 |  |  |  |  |  |  |  |  |  |
Days of trading day volume weighted average price of depositary units used to calculate the depositary units to be distributed |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |  |
Ratio of unit distributed per depositary unit |  |  |  | 0.005357 | 0.006269 | 0.006277 |  |  |  |  |  |  |  |  |  |
Additional investment in the Investment Funds |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |
One-time lump sum payment, percentage of profit, payable under Co-Manager Agreements |  |  |  |  |  |  |  |  |  |  |  |  | 5.10% | 7.50% |  |
Increase in amount due to each Co-Manager |  |  |  |  |  |  |  |  |  |  | 5,200,000 |  |  |  |  |
Balance that would have been due to eah Co-Manager if they had been 100% vested |  |  |  |  |  |  |  |  |  |  | 10,200,000 |  |  |  |  |
Hypothetical vested percentage used to calculate potential deferred asset management fee |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Saragon Portfolio beginning balance |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |
Saragon Portfolio, fair value |  |  |  |  |  |  |  |  |  | 587,000,000 |  |  |  |  |  |
Saragon Portfolio, gross profits since inception |  |  |  |  |  |  |  |  |  | 287,000,000 |  |  |  |  |  |
Saragon Portfolio, cummulative return since inception |  |  |  |  |  |  |  |  |  | 95.63% |  |  |  |  |  |
Term of New Co-Manager Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |
Investment funds to be made available by affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000,000 |  |
Investment Funds to be Made Available by Affiliates, Percentage by Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% | 20.00%
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |

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