Transactions with Affiliates - Additional Information (Detail)	9 Months Ended
	Sep. 29, 2018 USD ($) Facility	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Occupancy of facilities either on monthly or contractual basis | Facility	34
Insurance, claims and other receivables	$ 8,900,000		$ 10,100,000
Due to affiliates	15,174,000		11,964,000
Due from affiliates	3,221,000		$ 2,685,000
Affiliates [Member] | Used Equipment [Member]
Related Party Transaction [Line Items]
Cost of purchase from an affiliate	8,300	$ 1,800,000
Affiliates [Member] | Wheels and Tires [Member]
Related Party Transaction [Line Items]
Cost of purchase from an affiliate	$ 23,000	$ 1,800,000