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UNIT-BASED COMPENSATION (Inputs Used in Option Pricing Method) (Details)
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1 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
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Jul. 31, 2010
DFW Net Profits Interests
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Apr. 30, 2010
DFW Net Profits Interests
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Sep. 30, 2009
DFW Net Profits Interests
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Jan. 31, 2012
SMP Net Profits Interests
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Oct. 31, 2011
SMP Net Profits Interests
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Apr. 30, 2011
SMP Net Profits Interests
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Apr. 30, 2010
SMP Net Profits Interests
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Sep. 30, 2009
SMP Net Profits Interests
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Length of holding period restriction | 3 years 5 months 5 days | 3 years 9 months | 4 years 3 months | 2 years 11 months 5 days | 3 years 2 months 16 days | 4 years 9 months | 3 years 9 months | 4 years 3 months |
| Discount for lack of marketability (as a percent) | 35.90% | 30.90% | 34.80% | 24.00% | 33.10% | 29.60% | 30.90% | 34.80% |
| Volatility (as a percent) | 53.70% | 49.80% | 52.50% | 37.00% | 49.30% | 43.20% | 49.80% | 52.50% |