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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%