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Acquisitions and Dispositions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Apr. 30, 2017 | Apr. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Apr. 29, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition share price |  |  |  |  |  |  |  |  |  | $ 23.00
Stock-based compensation expense |  |  |  | $ 4,845 |  | $ 5,158 | $ 19,834 | $ 19,826 |  |
Total proceeds from sale of business unit, net of cash sold |  | $ 72,509 |  |  |  |  | 72,509 |  |  |
Pre-tax gain |  | $ 74,856 |  |  |  |  | 74,856 |  |  |
Net revenues |  |  |  | 486,267 |  | 380,660 | 1,404,177 | 890,202 |  |
Data Analytics Solutions Business [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | $ 12,700 |
Minority Interest in Private Company [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Investments in minority interest | $ 100 |  | $ 9,300 |  |  |  |  |  |  |
Impairment charges |  |  |  |  | $ 5,000 |  |  |  | $ 5,000 |
Newport [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition share price |  |  |  |  |  |  |  |  |  | $ 23.00
Fair value write-up of acquired finished goods inventory |  |  |  | 15,090 |  |  | 15,090 |  |  |
Incremental costs of sales charge |  |  |  |  |  | 4,971 |  | 15,090 |  |
Fair value write-up of acquired property, plant and equipment |  |  |  | $ 36,242 |  |  | $ 36,242 |  |  |
Compensation expense |  |  |  |  |  | 6,631 |  | 6,631 |  |
Stock-based compensation expense |  |  |  |  |  | $ 3,334 |  | $ 3,334 |  |

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