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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Initial cash consideration, net of cash acquired | $ 34,575 | $ 91 | $ 100
Goodwill | 715,644 | $ 686,108 | $ 683,683
Charge on contingent liability remeasured | 505 |  |
Payments Type One |  |  |
Business Acquisition [Line Items] |  |  |
Warranty and indemnity hold back payments | $ 2,000 |  |
Warranty and indemnity hold back payments release period | 18 months |  |
Liabilities fair value assumption discount rate percentage | 3.00% |  |
Payments Type Two |  |  |
Business Acquisition [Line Items] |  |  |
Warranty and indemnity hold back payments | $ 1,200 |  |
Warranty and indemnity hold back payments release period | four years |  |
Liabilities fair value assumption discount rate percentage | 3.25% |  |
TFC, DMS and Vista |  |  |
Business Acquisition [Line Items] |  |  |
Combined purchase consideration | $ 51,200 |  |
Initial cash consideration, net of cash acquired | 34,600 |  |
Goodwill | 32,100 |  |
Aggregate intangible assets arising from acquisitions | 10,600 |  |
Extended purchase commitments under the acquisition agreements | 6,500 |  |
Charge on contingent liability remeasured | 500 |  |
TFC, DMS and Vista | Level 3 |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of contingent consideration | $ 1,200 |  |

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