Commitments and Contingencies - Additional Information (Detail)									9 Months Ended
	Sep. 12, 2018 USD ($)	Sep. 10, 2018 USD ($)	Sep. 07, 2018 USD ($)	Sep. 05, 2018 USD ($)	Mar. 23, 2018 USD ($)	Jun. 30, 2017 USD ($)	Apr. 10, 2017 USD ($)	Mar. 13, 2017 USD ($)	Oct. 06, 2018 USD ($) Lawsuits	Dec. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Self-insurance reserves, current liabilities									$ 35,800,000	$ 30,100,000
Alleged complaints | Lawsuits									27
Class and / or Collective action treatment
Loss Contingencies [Line Items]
Alleged complaints | Lawsuits									23
Individual claims and do not seek class or collective action treatment
Loss Contingencies [Line Items]
Alleged complaints | Lawsuits									4
Plaintiffs’ motions for class certification
Loss Contingencies [Line Items]
Alleged complaints | Lawsuits									13
Long - Tennessee
Loss Contingencies [Line Items]
Legal settlement			$ 9,000,000
Lawsuit filing date									4/20/2017
Long - Tennessee | Settlement Funds
Loss Contingencies [Line Items]
Legal settlement			5,400,000
Long - Tennessee | Attorneys Fees
Loss Contingencies [Line Items]
Legal settlement			$ 3,600,000
North Carolina Class Action
Loss Contingencies [Line Items]
Legal settlement						$ 9,000,000
Lawsuit filing date									9/12/2012
North Carolina Class Action | Settlement Funds
Loss Contingencies [Line Items]
Legal settlement						5,200,000
North Carolina Class Action | Attorneys Fees
Loss Contingencies [Line Items]
Legal settlement						$ 3,800,000
Connecticut Class Action
Loss Contingencies [Line Items]
Legal settlement								$ 1,250,000
Lawsuit filing date									1/6/2015
Tennessee Class Action
Loss Contingencies [Line Items]
Legal settlement							$ 250,000
Lawsuit filing date									7/2/2015
Preliminary Approval of Class Action | Coyle - Arizona
Loss Contingencies [Line Items]
Legal settlement					$ 4,300,000
Lawsuit filing date									7/20/2015
Preliminary Approval of Class Action | Settlement Funds
Loss Contingencies [Line Items]
Legal settlement					1,200,000
Preliminary Approval of Class Action | Attorneys Fees
Loss Contingencies [Line Items]
Legal settlement					2,900,000
Preliminary Approval of Class Action | Incentive Payments
Loss Contingencies [Line Items]
Legal settlement					$ 200,000
Rosinbaum - NorthCarolina
Loss Contingencies [Line Items]
Lawsuit filing date									12/1/2015
McCurley - Carolina
Loss Contingencies [Line Items]
Legal settlement		$ 1,500,000
Lawsuit filing date									1/20/2016
McCurley - Carolina | Settlement Funds
Loss Contingencies [Line Items]
Legal settlement		800,000
McCurley - Carolina | Attorneys Fees
Loss Contingencies [Line Items]
Legal settlement		600,000
McCurley - Carolina | Incentive Payments
Loss Contingencies [Line Items]
Legal settlement		$ 100,000
Neff - Vermont
Loss Contingencies [Line Items]
Lawsuit filing date									12/2/2015
Noll - Maine
Loss Contingencies [Line Items]
Lawsuit filing date									12/3/2015
Zapata - Texas
Loss Contingencies [Line Items]
Legal settlement	$ 740,700
Lawsuit filing date									3/14/2016
Rodriguez - Texas
Loss Contingencies [Line Items]
Lawsuit filing date									1/28/2016
Richard - Louisiana
Loss Contingencies [Line Items]
Lawsuit filing date									10/21/2015
Carr - Pennsylvania
Loss Contingencies [Line Items]
Lawsuit filing date									12/1/2015
Boulange Pennsylvania
Loss Contingencies [Line Items]
Lawsuit filing date									3/25/2016
Medrano - Mexico
Loss Contingencies [Line Items]
Lawsuit filing date									4/27/2016
Martins Florida
Loss Contingencies [Line Items]
Lawsuit filing date									11/8/2016
Bryant - Texas
Loss Contingencies [Line Items]
Lawsuit filing date									10/9/2017
Green - Alabama
Loss Contingencies [Line Items]
Lawsuit filing date									5/11/2017
Hall - Alabama
Loss Contingencies [Line Items]
Lawsuit filing date									6/5/2017
Robbins - Mississippi
Loss Contingencies [Line Items]
Lawsuit filing date									7/31/2017
Schucker - New York
Loss Contingencies [Line Items]
Legal settlement				$ 1,300,000
Lawsuit filing date									5/9/2016
Schucker - New York | Settlement Funds
Loss Contingencies [Line Items]
Legal settlement				400,000
Schucker - New York | Attorneys Fees
Loss Contingencies [Line Items]
Legal settlement				900,000
Schucker - New York | Incentive Payments
Loss Contingencies [Line Items]
Legal settlement				$ 100,000