Accumulated Other Comprehensive Income (Loss) - Amounts Reclassified Out of AOCI into Income Statement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Losses on interest rate swap cash flow hedges, Tax provision		$ (87)
Losses on interest rate swap cash flow hedges, Net of tax		141
Prior service cost and unrecognized loss, Tax provision	(657)	(1,262)
Prior service cost and unrecognized loss, Net of tax		1,987
Total reclassifications for the period	967	2,128
Interest expense, net [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Losses on interest rate swap cash flow hedges, before tax		228
Warehousing, marketing and administrative expenses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service cost and unrecognized loss	1,624	3,249
Net of tax [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service cost and unrecognized loss, Net of tax	$ 967	$ 1,987