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Acquisitions - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
May 20, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 430,114 |  | $ 436,679
Revenues |  | 341,145 | $ 326,038 |
Net income (loss) |  | 43,674 | 23,232 |
Sierra Monitor Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Voting interest acquired (percentage) | 100.00% |  |  |
Payments to acquire businesses | $ 33,200 |  |  |
Goodwill | 19,900 | 19,900 |  |
Estimated future amortization expense, remainder of fiscal year |  | 900 |  |
Estimated future amortization, years two through four |  | 1,200 |  |
Estimated future amortization expense, year 4 |  | 1,100 |  |
Estimated future amortization expense, thereafter |  | 4,200 |  |
Step up to fair value of acquired inventory | $ 1,600 |  |  |
Amortization expense related to step up to fair value of acquired inventory |  | 400 |  |
Transaction costs |  | 900 |  |
Revenues |  | 5,700 |  |
Net income (loss) |  | 500 |  |
Transaction costs |  | $ 100 | $ 500 |
Customer relationships | Sierra Monitor Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life | 10 years |  |  |
Technology | Sierra Monitor Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life | 5 years |  |  |
Stock Options And Restricted Stock Units | Sierra Monitor Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 900 |  |  |

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