Transactions with Affiliates - Additional Information (Detail)			12 Months Ended
	Aug. 08, 2016 USD ($)	Aug. 04, 2016 USD ($) shares	Dec. 31, 2016 USD ($) Facility	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Related Party Transaction [Line Items]
Occupancy of facilities either on monthly or contractual basis | Facility			36
Insurance, claims and other receivables			$ 8,700,000	$ 11,500,000
Due to affiliates			4,597,000	3,413,000
Amounts paid for legal services			0	1,500	$ 92,000
Due from affiliates			2,513,000	1,924,000
Affiliates [Member]
Related Party Transaction [Line Items]
Cost of real property improvements			1,000,000
Affiliates [Member] | Snow Removal Equipment [Member]
Related Party Transaction [Line Items]
Cost of purchase from an affiliate				$ 18,000
Affiliates [Member] | Wheels and Tires [Member]
Related Party Transaction [Line Items]
Cost of purchase from an affiliate			2,300,000
Affiliates [Member] | Revenue Equipment [Member]
Related Party Transaction [Line Items]
Cost of purchase from an affiliate			$ 200,000
Chief Financial Officer [Member] | Restricted Stock [Member]
Related Party Transaction [Line Items]
Shares acquisition by exercise right of first refusal , Shares | shares		1,600
Shares acquisition by exercise right of first refusal , Value		$ 23,856
Crown Enterprises, Inc [Member]
Related Party Transaction [Line Items]
Cost of acquisition	$ 22,500,000