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Total Capital and Net Income Per Unit - Issuances of Common Units (Parenthetical) (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 31, 2013
Capital Unit [Line Items] |  |  |  |  |
Net proceeds from equity offerings |  | $ 35,374 | $ 182,139 | $ 190,520 |
General Partner's proportionate contribution |  | 2.00% | 2.00% | 2.00% |
Issuance of new common units, maximum aggregate amount |  |  |  |  | $ 100,000
General Partner [Member] |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
General Partner's proportionate contribution |  | 2.00% | 2.00% | 2.00% |
Continuous Offering Program 2014 [Member] |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Number of Common Stock Units Issued, Sold in public and continuing offering program | 160,000 |  |  |  |
Net proceeds from equity offerings | $ 6,800 |  |  |  |
General Partner's proportionate contribution | 2.00% |  |  |  |

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