Goodwill (Tables)

12 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in goodwill by segment

The following table summarizes changes in goodwill by segment for the periods indicated (in thousands):

	Crude Oil Logistics		Water Solutions			Liquids			Refined Products and Renewables		Total
	(in thousands)
Balances at March 31, 2016	$	579,846	$	290,915		$	266,046		$	51,127	$	1,187,934
Revisions to acquisition accounting	—		(1,110		)	—			—		(1,110		)
Acquisitions	—		9,803			—			—		9,803
Adjustment to initial impairment estimate	—		124,662			—			—		124,662
Balances at March 31, 2017	579,846		424,270			266,046			51,127		1,321,289
Revisions to acquisition accounting (Note 4)	—		195			—			—		195
Impairment	—		—			(116,877		)	—		(116,877		)
Balances at March 31, 2018	$	579,846	$	424,465		$	149,169		$	51,127	$	1,204,607