Inventory Financing Agreements(Textual) (Detail) barrel / d in Thousands		12 Months Ended
	Jun. 01, 2015 USD ($) barrel / d extension	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Feb. 29, 2016 USD ($) installment	Sep. 01, 2015 USD ($) payment
Supply and exchange agreement expenses		$ 28,506,000	$ 20,156,000	$ 17,995,000
Loss on termination of financing agreements		0	19,669,000	1,788,000
Accelerated deferred financing costs		30,024,000	4,907,000
Supply and Offtake Agreements
Supply and offtake agreement terms	3 years
Number Of commitment extensions | extension	2
Commitment period	1 year
Barrels of crude per day provided by J. Aron | barrel / d	94
Handling fees		7,800,000
Supply and exchange agreement expenses		3,200,000	1,500,000
Amount of deferred payment arrangement	$ 125,000,000	59,400,000
Percentage of receivables and inventory for deferred payment	85.00%
Deferral arrangement fee	$ 1,300,000
Outstanding amount of deferred payment arrangement		43,300,000
Fee agreement receivable					$ 14,600,000	$ 18,000,000
Number of fee agreement payments					18	14
Purchase And Supply Commitment, Fee Agreement Payable		$ 14,600,000
Supply and Offtake Agreements
Handling fees			6,900,000	16,500,000
Supply and exchange agreement expenses			2,300,000	$ 4,200,000
Loss on termination of financing agreements			17,400,000
Price variance loss commitment			13,300,000
Accelerated deferred financing costs			5,600,000
Exit fee received			$ 1,500,000
London Interbank Offered Rate (LIBOR) | Supply and Offtake Agreements
Margin on LIBOR rate	3.75%
Deferred payment availability fee	0.75%