Commitments and Contingencies - Additional Information (Detail)							12 Months Ended
	Feb. 14, 2018 USD ($)	Dec. 07, 2017 USD ($)	Oct. 04, 2017 USD ($)	Jun. 30, 2017 USD ($)	Apr. 10, 2017 USD ($)	Mar. 13, 2017 USD ($)	Dec. 30, 2017 USD ($) Lawsuits	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Self-insurance reserves, current liabilities							$ 30,100,000	$ 28,000,000
Alleged complaints | Lawsuits							33
Settlement Funds
Loss Contingencies [Line Items]
Legal settlement		$ 800,000
Settlement Funds | Subsequent Event
Loss Contingencies [Line Items]
Legal settlement	$ 400,000
Attorneys Fees
Loss Contingencies [Line Items]
Legal settlement		600,000
Attorneys Fees | Subsequent Event
Loss Contingencies [Line Items]
Legal settlement	900,000
Incentive Payments
Loss Contingencies [Line Items]
Legal settlement		100,000
Incentive Payments | Subsequent Event
Loss Contingencies [Line Items]
Legal settlement	100,000
Class and / or Collective action treatment
Loss Contingencies [Line Items]
Alleged complaints | Lawsuits							22
Individual claims and do not seek class or collective action treatment
Loss Contingencies [Line Items]
Alleged complaints | Lawsuits							16
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
Preliminary Approval of Class Action | Coyle - Arizona
Loss Contingencies [Line Items]
Legal settlement			$ 4,300,000
Lawsuit filing date							Jul. 20, 2015
Martinez - California
Loss Contingencies [Line Items]
Lawsuit filing date							Jul. 07, 2015
Rosinbaum - NorthCarolina
Loss Contingencies [Line Items]
Lawsuit filing date							Dec. 01, 2015
McCurley - Carolina
Loss Contingencies [Line Items]
Legal settlement		$ 1,500,000
Lawsuit filing date							Jan. 20, 2016
Neff - Vermont
Loss Contingencies [Line Items]
Lawsuit filing date							Dec. 02, 2015
Noll - Maine
Loss Contingencies [Line Items]
Lawsuit filing date							Dec. 03, 2015
Zapata - Texas
Loss Contingencies [Line Items]
Lawsuit filing date							Mar. 14, 2016
Rodriguez - Texas
Loss Contingencies [Line Items]
Lawsuit filing date							Jan. 28, 2016
Richard - Louisiana
Loss Contingencies [Line Items]
Lawsuit filing date							Oct. 21, 2015
Carr - Pennsylvania
Loss Contingencies [Line Items]
Lawsuit filing date							Dec. 01, 2015
Boulange Pennsylvania
Loss Contingencies [Line Items]
Lawsuit filing date							Mar. 25, 2016
Soares - California
Loss Contingencies [Line Items]
Lawsuit filing date							Oct. 26, 2015
Medrano - Mexico
Loss Contingencies [Line Items]
Lawsuit filing date							Apr. 27, 2016
Schucker - New York
Loss Contingencies [Line Items]
Lawsuit filing date							May 09, 2016
Schucker - New York | Subsequent Event
Loss Contingencies [Line Items]
Legal settlement	$ 1,300,000
Long - Tennessee
Loss Contingencies [Line Items]
Lawsuit filing date							Apr. 20, 2017
Wiatrek Texas
Loss Contingencies [Line Items]
Lawsuit filing date							Aug. 15, 2017
North Carolina Class Action
Loss Contingencies [Line Items]
Legal settlement				$ 9,000,000
Lawsuit filing date							Sep. 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							Jan. 06, 2015
Tennessee Class Action
Loss Contingencies [Line Items]
Legal settlement					$ 250,000
Lawsuit filing date							Jul. 02, 2015