Partners' Capital and Distributions - Additional Information (Detail) - $ / shares		12 Months Ended
	Nov. 16, 2016	Dec. 31, 2016	Dec. 31, 2015
Limited Partners Capital Account [Line Items]
Cash distribution after period end of each quarter		60 days
Annualized Basis [Member]
Limited Partners Capital Account [Line Items]
Cash distribution received, per unit		$ 1.55
Common Units [Member]
Limited Partners Capital Account [Line Items]
Limited partners' units outstanding		19,477,021	13,174,410
Cash distribution received, per unit		$ 0.3875
Common Units [Member] | Lightfoot Capital Partners LP And Lightfoot Capital Partners GPLLC [Member]
Limited Partners Capital Account [Line Items]
Limited partners' units outstanding		5,242,775
Subordinated Units [Member]
Limited Partners Capital Account [Line Items]
Limited partners' units outstanding		0	6,081,081
Conversion of subordinated units to common units	6,081,081
Description of subordinated units conversion		As a result, effective November 16, 2016, the 6,081,081 subordinated units, of which 5,146,264 were owned by Lightfoot, converted on a one-for-one basis into common units and thereafter participate on terms equal with all other common units in distributions of available cash.
Subordinated Units [Member] | Lightfoot Capital Partners LP And Lightfoot Capital Partners GPLLC [Member]
Limited Partners Capital Account [Line Items]
Conversion of subordinated units to common units	5,146,264
All Unitholders [Member]
Limited Partners Capital Account [Line Items]
Cash distribution received, per unit		$ 0.4456