Commitments and Contingencies Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) claim	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) claim	Oct. 25, 2011
Commitments and Contingencies [Line Items]
Earnout payment percentage of EBITDA						400.00%
Minimum EBITDA benchmark	$ 3,500,000.0		$ 3,500,000.0
maximum earnout payment amount	4,500,000.0		4,500,000.0
Contingent consideration	23,555,000		$ 23,555,000		$ 9,131,000
Number of remaining claim to be resolved | claim					27
Remaining Filed Claims					$ 26,500,000
Estimated value of claims remaining to be settled					1,100,000
Claims settled | claim			0
Amortization of Intangible Assets	1,000,000	$ 900,000	$ 1,600,000	$ 1,800,000
Tesoros [Member]
Commitments and Contingencies [Line Items]
Deductible for indemnification obligation			1,000,000
Indemnification obligation cap	15,000,000		15,000,000
Clear Air Act Violation [Member]
Commitments and Contingencies [Line Items]
Final decree low estimate			20,000,000
Final decree high estimate			25,000,000
Pending Litigation [Member]
Commitments and Contingencies [Line Items]
Claim amount for environmental losses	1,000,000		1,000,000
Tesoro Earnout Dispute [Member]
Commitments and Contingencies [Line Items]
Contingent consideration	$ 1,000,000		$ 1,000,000		$ 0