Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Division Segment shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 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	$ 0	$ 0
Period for warranties for rental equipment	90 days
Period for warranties for equipment manufactured	1 year
Property, plant and equipment depreciation expenses	$ 8,900,000	8,600,000	8,200,000
Capitalized in internal use of software	200,000	100,000
Total advertising expenses	5,100,000	3,900,000	3,600,000
Goodwill and trade name intangible assets	138,300,000	34,100,000
Impairment charges		0	0
Goodwill and intangible assets impairment charge	$ 0	$ 0	$ 0
Anti-dilutive securities excluded from computation of diluted earnings per share | shares	0	0	0
Common stock shares authorized for repurchase | shares				2,000,000
Common stock repurchased | shares	0	282,221	0
Average price per repurchased share | $ / shares		$ 48.25
Aggregate purchase price		$ 13,600,000
Shares remain authorized for repurchase | shares	1,309,805	1,309,805
Unbilled receivables related to end-of-lease services	$ 46,200,000	$ 38,700,000
Period for credit risk identified	30 days
Bad debt expense	$ 451,000	1,343,000	$ 1,013,000
Allowance for doubtful accounts	2,125,000	2,100,000	$ 1,883,000
Net investment in sales-type leases	2,200,000	1,800,000
Credit loss expense	0
Estimated fair value notes payable	158,500,000	103,100,000
Recorded fair value of notes payable	$ 160,000,000.0	$ 100,000,000.0
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Sales-type leases terms	12 months
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Sales-type leases terms	36 months