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Acquisitions - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 20, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  |  | $ 33,196 | $ 0 |
Goodwill |  |  | $ 428,629 |  | 428,629 |  | $ 413,640
Strategic transaction costs |  |  | 952 | $ 56 | 2,937 | 208 |
Revenues |  |  | 351,014 | 331,096 | 1,026,726 | 996,320 |
Net income (loss) |  |  | 42,239 | $ 33,717 | 105,278 | $ 99,267 |
Sierra Monitor Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Voting interest acquired (percentage) | 100.00% |  |  |  |  |  |
Payments to acquire businesses | $ 33,200 |  |  |  |  |  |
Goodwill | 19,800 |  | 19,800 |  | 19,800 |  |
Estimated future amortization expense, remainder of fiscal year |  |  | 300 |  | 300 |  |
Estimated future amortization expense, year 1 | 1,200 |  |  |  |  |  |
Estimated future amortization expense, year 2 | 1,200 |  |  |  |  |  |
Estimated future amortization expense, year 3 | 1,200 |  |  |  |  |  |
Estimated future amortization expense, year 4 | 1,200 |  |  |  |  |  |
Estimated future amortization expense, year 5 | 1,200 |  |  |  |  |  |
Estimated future amortization expense, thereafter | 5,300 |  |  |  |  |  |
Step up to fair value of acquired inventory | $ 1,600 |  |  |  |  |  |
Amortization expense related to step up to fair value of acquired inventory |  |  |  |  | 1,100 |  |
Transaction costs |  |  | 1,000 |  | 2,900 |  |
Revenues |  |  |  |  | 8,200 |  |
Net income (loss) |  |  |  |  | (3,000) |  |
Purchase accounting amortization excluded from acquisitions |  |  |  |  | 1,500 |  |
Transaction costs |  |  | $ 2,100 |  | 2,100 |  |
Adjusted earnings excluded from acquisitions |  |  |  |  | 900 |  |
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 |  |  |  |  |  |
Performance Stock Unit | Sierra Monitor Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Stock compensation cost |  |  |  |  | $ 1,500 |  |
Forecast | Subsequent Event | Sierra Monitor Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortization expense related to step up to fair value of acquired inventory |  | $ 500 |  |  |  |  |

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