Acquisitions (Detail) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 01, 2015	Jun. 02, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Cash consideration net of cash acquired					$ 0	$ 582
Term loan			$ 171,407		171,407		$ 136,610
Revenues			583,759	$ 802,137	1,127,370	1,545,383
Net income (loss)			11,723	$ (24,677)	12,185	$ (39,245)
Mid Pac Petroleum, LLC [Member]
Business Acquisition [Line Items]
Cash consideration transferred prior to certain post-closing adjustments	$ 73,300
Cash consideration net of cash acquired	58,300
Advanced deposits	15,000						10,000
Deposit against purchase price							$ 10,000
Revenues			53,600		53,600
Net income (loss)			$ 2,800		$ 2,800
Mid Pac Petroleum, LLC [Member]
Business Acquisition [Line Items]
Term loan	45,300
Mid Pac Credit Agreement [Member] | Mid Pac Petroleum, LLC [Member]
Business Acquisition [Line Items]
Term loan	$ 55,000
Koko' oha Investments, Inc. [Member] | Mid Pac Petroleum, LLC [Member]
Business Acquisition [Line Items]
Outstanding membership interests of Mid Pac Petroleum, LLC		100.00%