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Summary of Common Units Received Under Adjustment Agreement (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |
Fair Value of Common Units Received | $ 15,421 | $ 8,216 | $ 98,797
Annual Common Unit Adjustment |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair Value of Common Units Received | $ 15,421 | $ 8,216 | $ 8,869
Number of Common Units Received | 1,074,910 | 557,631 | 588,024
Date Common Units Received | Mar. 31, 2015 | Mar. 27, 2014 | Mar. 28, 2013
Extraordinary Common Unit Adjustment |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair Value of Common Units Received |  |  | $ 89,928
Number of Common Units Received |  |  | 5,315,837
Date Common Units Received |  |  | May 29, 2013

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