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Acquisitions - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 20, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition, net of cash acquired (Note 19) |  |  |  | $ 0 | $ 33,196 |
Goodwill |  | $ 430,671 |  | 430,671 |  | $ 436,679
Revenues |  | 314,438 | $ 349,675 | 655,583 | 675,713 |
Net income (loss) |  | 36,066 | 39,806 | 79,741 | 63,038 |
Sierra Monitor Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Voting interest acquired (percentage) | 100.00% |  |  |  |  |
Acquisition, net of cash acquired (Note 19) | $ 33,200 |  |  |  |  |
Goodwill | 19,900 | 19,900 |  | 19,900 |  |
Estimated future amortization expense, remainder of fiscal year |  | 600 |  | 600 |  |
Estimated future amortization, years two through four |  | 1,200 |  | 1,200 |  |
Estimated future amortization expense, year 4 |  | 1,100 |  | 1,100 |  |
Estimated future amortization expense, thereafter |  | 4,200 |  | 4,200 |  |
Step up to fair value of acquired inventory | $ 1,600 |  |  |  |  |
Amortization expense related to step up to fair value of acquired inventory |  |  |  | 600 |  |
Transaction costs |  |  |  | 2,000 |  |
Revenues |  |  |  | 11,100 |  |
Net income (loss) |  |  |  | 1,400 |  |
Transaction costs |  | $ 200 | $ 2,000 | $ 200 | $ 2,000 |
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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