Commitments and Contingencies (Details)			12 Months Ended
	Oct. 27, 2017 class_action	Jan. 30, 2017 class_action	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Expense under contribution profit sharing plans			$ 2,500,000	$ 2,400,000	$ 2,800,000
Rent expense			83,400,000	72,800,000	$ 66,600,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017			51,490,000
2018			38,558,000
2019			26,735,000
2020			17,948,000
2021			16,202,000
Thereafter			23,285,000
Total			174,218,000
Commitments and Contingencies (Textual) [Abstract]
Self insurance reserve			1,000,000
Reserves for estimated uninsured losses			1,800,000	8,900,000
Number of class-action lawsuit filed | class_action	1	3
Auto And General Liability Insurance
Commitments and Contingencies (Textual) [Abstract]
Liability and cargo insurance coverage for claims			100,000,000
Insurance Claims
Commitments and Contingencies (Textual) [Abstract]
Liability and cargo insurance coverage for claims			1,000,000
Cargo Claims
Commitments and Contingencies (Textual) [Abstract]
Liability and cargo insurance coverage for claims			100,000
Uninsured Risk
Commitments and Contingencies (Textual) [Abstract]
Reserves for estimated uninsured losses			28,400,000	$ 21,500,000
Labor Related Lawsuits And Administrative Actions
Commitments and Contingencies (Textual) [Abstract]
Reserves for estimated uninsured losses			13,200,000
Other Litigation
Commitments and Contingencies (Textual) [Abstract]
Reserves for estimated uninsured losses			$ 10,400,000