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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 20, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  |  |  | $ 0 | $ 33,196 | $ 0
Estimated amortization period |  |  |  |  |  |  |  |  |  | 14 years |  |
Goodwill |  | $ 443,272 |  |  |  | $ 436,679 |  |  |  | $ 443,272 | 436,679 | 413,640
Strategic transaction costs (Note 13) |  |  |  |  |  |  |  |  |  | 717 | 4,400 | 421
Revenues |  | 388,248 | $ 304,392 | $ 314,438 | $ 341,145 | 375,254 | $ 351,014 | $ 349,675 | $ 326,038 | 1,348,223 | 1,401,981 | 1,358,104
Net income (loss) |  |  |  |  |  |  |  |  |  | 120,101 | 136,440 | 124,150
Depreciation |  |  |  |  |  |  |  |  |  | 27,700 | 26,500 | 26,900
Amortization primarily related to intangible assets |  |  |  |  |  |  |  |  |  | 11,570 | 11,119 |
Americas |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 293,200 |  |  |  |  |  |  |  | 293,200 |  |
Revenues |  |  |  |  |  |  |  |  |  | 874,305 | 915,118 | $ 854,287
Sierra Monitor Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock acquired (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 33,200 |  |  |  |  |  |  |  |  |  |  |
Future amortization expense, year one |  | 1,000 |  |  |  |  |  |  |  | 1,000 |  |
Future amortization expense, year two |  | 1,000 |  |  |  |  |  |  |  | 1,000 |  |
Future amortization expense, year three |  | 1,000 |  |  |  |  |  |  |  | 1,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 1,000 |  |  |  |  |  |  |  | 1,000 |  |
Future amortization expense, year five |  | $ 1,000 |  |  |  |  |  |  |  | 1,000 |  |
Step up to fair value of acquired inventory as part of purchase price allocation | 1,600 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 19,900 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 21,200 |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 2,800 |  |
Purchase accounting amortization for intangible assets and inventory step up excluded from acquisitions |  |  |  |  |  |  |  |  |  | 1,200 | 2,600 |
Business Acquisition, Transaction Costs |  |  |  |  |  | $ 2,200 |  |  |  |  | 2,200 |
Net income related to acquiree adjusted to remove transaction costs |  |  |  |  |  |  |  |  |  | $ 3,800 | 1,500 |
Sierra Monitor Corporation | Americas |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 19,900 |  |  |  |  |  |  |  |  |  |  |
Globe Holding Company LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 13,500 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | (3,300) |
Technology related assets |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization period |  |  |  |  |  |  |  |  |  | 8 years |  |
Technology related assets | Sierra Monitor Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization period | 5 years |  |  |  |  |  |  |  |  |  |  |
Customer-related intangibles | Sierra Monitor Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization period | 10 years |  |  |  |  |  |  |  |  |  |  |
Stock Options And Restricted Stock Units | Sierra Monitor Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 900 |  |  |  |  |  |  |  |  |  |  |
Performance Stock | Sierra Monitor Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  | $ 1,500 |

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