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Total Capital and Net Income Per Unit - Additional Information (Detail) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015
Capital Unit [Line Items] |  |
Days after year-end where limited partner's have right to receive cash distribution | 45 days |
Minimum percentage of holding by unitholders to remove general partner | 66.67% |
Minimum [Member] | Common Stock [Member] |  |
Capital Unit [Line Items] |  |
Cash distribution per unit |  | $ 0.4625
Maximum [Member] | Common Stock [Member] |  |
Capital Unit [Line Items] |  |
Cash distribution per unit | $ 0.4625 |

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