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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items] |  |  |
Gain/Loss on remeasurement of contingent consideration | $ 0.7 | $ 1.4 | $ (1.9)
Senior Notes | 6% senior notes due 2022 |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |
Interest rate (as a percent) | 6.00% |  |
Debt maturity period | 2022 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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