Inventories (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Crude oil and feedstocks	$ 147,519,000	$ 61,302,000
Refined products and blendstock	124,576,000	116,593,000
Warehouse stock and other	20,974,000	20,431,000
Total	293,069,000	198,326,000
Reserves for the lower of cost or market value of inventory	0	200,000
Titled Inventory
Inventory [Line Items]
Crude oil and feedstocks	60,169,000	11,620,000
Refined products and blendstock	42,011,000	38,916,000
Warehouse stock and other	20,974,000	20,431,000
Total	123,154,000	70,967,000
Supply and Offtake Agreements
Inventory [Line Items]
Crude oil and feedstocks	87,350,000	49,682,000
Refined products and blendstock	82,565,000	77,677,000
Warehouse stock and other	0	0
Total	$ 169,915,000	$ 127,359,000