Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Inventory Disclosure [Line Items]
Refined petroleum products	$ 285,509	[1]	$ 340,659	[1]
Materials and supplies	12,795		10,946
Total inventories	$ 298,304		$ 351,605

[1] Ending inventory was 99.6 million and 134.9 million gallons of refined petroleum products at December 31, 2011 and 2010, respectively.