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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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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 |  |  |

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