Leases - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Line Items]
Lessee, operating lease, description	The Company leases real estate for certain of its branch offices and rental equipment storage yards, vehicles and equipment used in its rental operations. The Company determines if an arrangement is a lease at inception. The Company has leases with lease and non-lease components, which are accounted for separately.
Lessee, operating lease, option to extend	true
Lessee, operating lease, option to extend, description	These leases include one or more options to renew, with renewal terms that may extend the lease term from one to three years.
Operating lease, right of use assets	$ 8,300,000	$ 9,900,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PrepaidExpenseAndOtherAssets	us-gaap:PrepaidExpenseAndOtherAssets
Operating lease liabilities	$ 8,287,000	$ 9,900,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
Operating lease expense	$ 3,800,000
Short term lease expense	$ 100,000
Weighted-average remaining lease term for operating leases	3 years 2 months 12 days
Weighted-average discount rate for operating leases	3.95%
Sub-lease income	$ 0
Finance lease liability	$ 0
Lessor, operating lease, description	The Company’s equipment rentals for each of its operating segments are governed by agreements that detail the lease terms and conditions.  The determination of whether these contracts with customers contain a lease generally does not require significant judgement.  The Company accounts for these rentals as operating leases.
Lessor, operating lease, option to extend	true
Lessor, operating lease, option to extend description	Initial lease terms vary in length based upon customer needs and generally range from one to sixty months.
Lease revenue	$ 401,900,000
Operating lease revenue	399,500,000
Finance lease revenue	2,400,000
Finance lease revenue, sales revenue	2,200,000
Finance lease revenue, interest income	$ 200,000
Minimum [Member]
Leases [Line Items]
Lessee, operating lease, renewal term	1 year
Lessor, operating lease, renewal term	1 month
Lessor, operating lease, rental products, useful lives	3 years
Maximum [Member]
Leases [Line Items]
Lessee, operating lease, renewal term	3 years
Lessor, operating lease, renewal term	60 months
Lessor, operating lease, rental products, useful lives	5 years