Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($) Division Segment shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Aug. 31, 2015 shares
Summary Of Significant Accounting Policies [Line Items]
Number of divisions | Division	4
Number of reportable segments | Segment	4
Impairments of long-lived assets	$ 0	$ 39,000	$ 1,639,000
Period for warranties for rental equipment	90 days
Period for warranties for equipment manufactured	1 year
Property, plant and equipment depreciation expenses	$ 8,200,000	8,000,000.0	7,600,000
Capitalized in internal use of software	3,000,000.0	100,000
Total advertising expenses	$ 3,600,000	3,200,000	2,900,000
Estimated useful life in years, Customer relationships	11 years
Goodwill and trade name intangible assets	$ 34,100,000	33,700,000
Goodwill and intangible assets impairment charge	$ 0	$ 0	$ 0
Options to purchase common stock | shares	0	0	7,000
Common stock shares authorized for repurchase | shares				2,000,000
Common stock repurchased | shares	0	0	0
Shares remain authorized for repurchase | shares	1,592,026
Unbilled receivables related to end-of-lease services	$ 37,200,000	$ 32,300,000
Period for credit risk identified	30 days
Estimated fair value notes payable	$ 101,400,000	99,000,000.0
Recorded fair value of notes payable	$ 100,000,000.0	100,000,000.0
Modular Rental Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairments of long-lived assets		$ 100,000	$ 1,600,000