Summary of Significant Accounting Policies - Additional Information (Detail)			3 Months Ended		9 Months Ended		29 Months Ended
	Nov. 16, 2016 shares	May 31, 2015 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Segment	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule Of Accounting Policies [Line Items]
Impairment charges					$ 0	$ 0
Percentage of reporting unit fair value in excess of carrying value								11.00%
Reported earn-out payments					$ 2,153,000	1,028,000
Number of reportable segment | Segment					1
Distributions to noncontrolling interest holders					$ 7,200,000	8,000,000
Equity contribution from non-controlling interests					$ 1,575,000	0
Subordinated Units [Member]
Schedule Of Accounting Policies [Line Items]
Conversion of subordinated units to common units | shares	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.
Partners Capital Account Units Converted Ratio	100.00%
Subordinated Units [Member] | Lightfoot Capital Partners LP And Lightfoot Capital Partners GPLLC [Member]
Schedule Of Accounting Policies [Line Items]
Conversion of subordinated units to common units | shares	5,146,264
Joliet Terminal Acquisition [Member] | Earn Out Obligation [Member]
Schedule Of Accounting Policies [Line Items]
Fair value of contingent consideration obligation			$ 17,600,000		$ 17,600,000		$ 17,600,000	$ 18,000,000
Joliet Terminal Acquisition [Member] | Minimum [Member] | Earn Out Obligation [Member]
Schedule Of Accounting Policies [Line Items]
Discount rates					7.10%
Joliet Terminal Acquisition [Member] | Maximum [Member] | Earn Out Obligation [Member]
Schedule Of Accounting Policies [Line Items]
Discount rates					7.70%
JBBR Acquisition [Member]
Schedule Of Accounting Policies [Line Items]
Fair value of contingent consideration obligation		$ 19,700,000	17,600,000		$ 17,600,000		17,600,000	18,000,000
Cash paid to seller					216,000,000
Initial valuation		19,700,000
Earn-out payments		$ 27,000,000	27,000,000		27,000,000		27,000,000
Non-cash loss (gain) on the revaluation of the earn-out liability			500,000	$ 500,000	1,465,000	(300,000)
Earn-out payments			600,000	$ 300,000	1,865,000	$ 1,000,000
Reported earn-out payments							4,600,000
JBBR Acquisition [Member] | Revenue Estimates [Member]
Schedule Of Accounting Policies [Line Items]
Fair value of contingent consideration obligation			$ 17,600,000		$ 17,600,000		$ 17,600,000	$ 18,000,000
JBBR Acquisition [Member] | Minimum [Member] | Revenue Estimates [Member]
Schedule Of Accounting Policies [Line Items]
Discount rates					7.10%
JBBR Acquisition [Member] | Maximum [Member] | Revenue Estimates [Member]
Schedule Of Accounting Policies [Line Items]
Discount rates					7.70%