Debt - Additional Information (Detail)	1 Months Ended		9 Months Ended
	Jul. 31, 2015 USD ($)	Nov. 30, 2013 USD ($)	Sep. 30, 2017 USD ($)	May 31, 2017	Dec. 31, 2016 USD ($)	Jun. 30, 2016	May 31, 2015 USD ($)
Line Of Credit Facility [Line Items]
Credit facility			$ 256,000,000		$ 249,000,000
Sublimit for issuance of swing line loans			$ 5,000,000
Percentage of increase in interest rate on default exists		2.00%
Joliet Holding [Member] | GE Energy Financial Services [Member]
Line Of Credit Facility [Line Items]
Business combination, equity interest in acquire percentage			40.00%
Arc Terminals Holdings [Member] | Pawnee Terminal Acquisition [Member]
Line Of Credit Facility [Line Items]
Business combination consideration transferred net of adjustment	$ 76,600,000
Credit Facility [Member]
Line Of Credit Facility [Line Items]
Credit Facility, maturity date			Nov. 30, 2018
Line of Credit Facility, amount	$ 300,000,000	$ 175,000,000	$ 300,000,000				$ 275,000,000
Credit facility			$ 256,000,000
Line of Credit Facility, interest rate			4.25%
Available capacity under the credit facility			$ 25,000,000
Amount of commitments under credit facility			100,000,000
Maximum leverage ratio to be maintained as per credit facility		4.50				4.50
Minimum interest coverage ratio		2.50
Maximum secured leverage ratio		3.50
Credit Facility [Member] | Senior Notes [Member]
Line Of Credit Facility [Line Items]
Future issuance of debt		$ 200,000,000
Credit Facility [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Commitment fee percentage on unused portion of facility		0.375%
Credit Facility [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Commitment fee percentage on unused portion of facility		0.50%
Increase in Partnership leverage ratio		5.00		5.00		5.00
Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Basis points spread on floating rate debt		1.00%
Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Basis points spread on floating rate debt		2.25%
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Basis points spread on floating rate debt		2.00%
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Basis points spread on floating rate debt		3.25%
Credit Facility [Member] | One-Month LIBOR Rate [Member]
Line Of Credit Facility [Line Items]
Basis points spread on floating rate debt		1.00%
Credit Facility [Member] | Federal Funds Rate [Member]
Line Of Credit Facility [Line Items]
Basis points spread on floating rate debt		0.50%
Credit Facility [Member] | Standby Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Sublimit for letters of credit		$ 10,000,000	$ 20,000,000				$ 20,000,000