Property, Plant and Equipment - Additional information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 04, 2015	Dec. 31, 2013	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 7,470,000		$ 7,170,000
Property, plant and equipment net of accumulated depreciation, under a capital lease agreement	21,600		22,800
Gross property, plant and equipment acquired under capital lease	25,400
Total obligations associated with capital lease agreement	22,100		23,200
Capital lease obligations classified in accrued expenses and other current liabilities	2,200		2,200
Capital lease obligations classified in deferred credits and other liabilities	19,900		21,000
Property plant and equipment written down		$ 21,000
Inventory written down		7,000
Insurance receivable		$ 14,000
Initial payments from insurance receivables	10,300
Property, plant and equipment, net	5,120,870		5,287,639
Two remaining storage domes [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	19,800
Net fixed assets associated with anticipated further development activities at the St. James Parish Site [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 84,100		$ 84,100