Equity and Distributions - Summary of Quarterly Cash Distribution Rates (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Limited Partners Capital Account [Line Items]
Distribution made to member or limited partner, date of declaration	Jul. 26, 2016	Apr. 26, 2016	Jan. 26, 2016	Oct. 26, 2015	Jul. 24, 2015	Apr. 24, 2015	Jan. 26, 2015	Oct. 23, 2014	Jul. 24, 2014	Apr. 24, 2014
Distribution made to member or limited partner, date of record	Aug. 05, 2016	May 06, 2016	Feb. 05, 2016	Nov. 05, 2015	Aug. 05, 2015	May 06, 2015	Feb. 05, 2015	Nov. 05, 2014	Aug. 05, 2014	May 06, 2014
Distribution made to member or limited partner, date of distribution	Aug. 12, 2016	May 13, 2016	Feb. 12, 2016	Nov. 12, 2015	Aug. 12, 2015	May 13, 2015	Feb. 12, 2015	Nov. 12, 2014	Aug. 12, 2014	May 13, 2014
Distribution per unit	$ 0.0300	$ 0.0300	$ 0.1000	$ 0.3000	$ 0.5500	$ 0.5500	$ 0.5500	$ 0.5500	$ 0.5500	$ 0.5500
Aggregate Distribution	$ 2,500,000	$ 2,500,000	$ 8,300,000	$ 24,900,000	$ 45,700,000	$ 46,300,000	$ 46,300,000	$ 47,800,000	$ 39,500,000	$ 33,800,000
Distribution Received by Affiliates					$ 100,000	$ 200,000	$ 3,100,000	$ 3,100,000	$ 3,000,000	$ 3,000,000
Maximum [Member]
Limited Partners Capital Account [Line Items]
Distribution Received by Affiliates	$ 100,000	$ 100,000	$ 100,000	$ 100,000