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Financial Instruments - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Assets Sold Under Agreements To Repurchase [Line Items] |  |  |  |  |
Long-term debt, fair value | $ 490,800,000 |  | $ 490,800,000 |  | $ 513,500,000
Long-term debt, carrying value | 475,000,000 |  | 475,000,000 |  | $ 500,000,000
Fair value of future expected acquisition-related contingent consideration obligations | 5,200,000 |  | $ 5,200,000 |  |
Contingent purchase price obligation payment extending year |  |  | 2018 |  |
Gain/Loss on remeasurement of contingent consideration | $ 0 | $ 0 | $ 1,000,000 | $ 1,700,000 |
Contractual Settlement |  |  |  | $ 1,500,000 |
2022 Notes |  |  |  |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |  |  |  |
Interest percentage | 6.00% |  | 6.00% |  |
Debt maturity period |  |  | 2022 |  | 2022
Senior Bank Credit Facility |  |  |  |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |  |  |  |
Line of credit maximum borrowing capacity | $ 550,000,000 |  | $ 550,000,000 |  | $ 550,000,000

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