Multi-employer Benefit Plans (Details) (USD $)	12 Months Ended								3 Months Ended
	Dec. 31, 2014 plan		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2009	Dec. 31, 2008	Jul. 01, 2011	Jul. 11, 2012
Multiemployer Plans [Abstract]
Number of multiemployer plans participating in	2
Multiemployer pension withdrawal	$ 0		$ 0		$ 39,000
Multiemployer plans, collective-bargaining arrangement, percentage of employer's contributions	5.00%
Multiemployer plan, period contributions	1,197,000		1,158,000		1,168,000
Amortization of loss period							15 years	30 years
Investment loss recognition period							5 years	10 years
Teamsters Pension Trust Fund of Philadelphia and Vicinity
Multiemployer Plans [Abstract]
Multiemployer plan, period contributions	248,000	[1]	220,000	[1]	213,000	[1]
Warehouse Employees Local 169 and Employers Joint Pension Fund
Multiemployer Plans [Abstract]
Multiemployer plan, period contributions	949,000		938,000		955,000
U.S. Commercial Products
Multiemployer Plans [Abstract]
Multiemployer plans, withdrawal obligation										1,200,000
Withdrawal obligation settlement period	20 years
Scenario, Previously Reported | U.S. Commercial Products
Multiemployer Plans [Abstract]
Multiemployer pension withdrawal									$ 1,200,000

[1] The Trustees of the Teamsters Pension Trust Fund of Philadelphia and Vicinity elected to apply the special amortization and special asset valuation provisions provided for under the Preservation of Access to Care for Medicare Beneficiaries and Pension Relief Act of 2010 (PRA 2010) for Plan Years beginning January 1, 2009 and later. The special amortization rule allows that portion of the plan’s experience loss attributable to net investment losses incurred in the year ended December 31, 2008 to be amortized over a 30-year period rather than a 15-year period. The special asset valuation rule allows the recognition of investment losses in the year ended December 31, 2008 to be spread over a 10-year period rather than a 5-year period.