Annual report pursuant to Section 13 and 15(d)

Summary of Common Units Received Under Adjustment Agreement (Detail)

v3.3.1.900
Summary of Common Units Received Under Adjustment Agreement (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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