Net Income per Limited Partnership Unit - Schedule of Reconciliation of Net Income and Allocation of Net Income to Limited Partners' Interest for Purposes of Computing Net Income per Limited Partner Unit (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	2 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Distributions paid		$ 41,463	$ 25,998	$ 36,740
Denominator:
Weighted average limited partnership units outstanding-basic	7,525,000	12,402,938	7,731,471
Weighted average limited partnership units outstanding-diluted	7,525,000	12,402,938	7,780,357
Common Units [Member]
Numerator:
Distributions paid		25,544	12,999
Allocation of distributions in excess of net income		(29,532)	(3,842)
Limited partners' interest in net income (loss) -basic		(3,988)	9,157
Adjustment for phantom units			29
Limited partners' interest in net income (loss) -diluted		(3,988)	9,186
Denominator:
Weighted average limited partnership units outstanding-basic		12,402,938	7,731,471
Adjustment for phantom units			48,886
Weighted average limited partnership units outstanding-diluted		12,402,938	7,780,357
Net income per limited partnership unit-basic		$ (0.32)	$ 1.18
Net income per limited partnership unit-diluted		$ (0.32)	$ 1.18
Subordinated Units [Member]
Numerator:
Distributions paid		15,652	12,999
Allocation of distributions in excess of net income		(18,071)	(4,086)
Limited partners' interest in net income (loss) -basic		(2,419)	8,913
Limited partners' interest in net income (loss) -diluted		$ (2,419)	$ 8,913
Denominator:
Weighted average limited partnership units outstanding-basic		7,525,000	7,525,000
Weighted average limited partnership units outstanding-diluted		7,525,000	7,525,000
Net income per limited partnership unit-basic		$ (0.32)	$ 1.18
Net income per limited partnership unit-diluted		$ (0.32)	$ 1.18