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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Assets Sold Under Agreements To Repurchase [Line Items] |  |  |  |
Gain/Loss on remeasurement of contingent consideration |  | $ 1.9 | $ 2.7 | $ 13.6
Accretion expense |  | $ 0.7 | $ 1.0 | $ 2.7
6.0% Senior Notes Due 2022 |  |  |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |  |  |
Interest percentage |  | 6.00% | 6.00% |
Debt maturity period |  | 2022 | 2022 |
6 3/4 % Senior Notes Due 2020 |  |  |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |  |  |
Interest percentage | 6.75% | 6.75% | 6.75% |
Debt maturity period | 2020 | 2020 | 2020 |

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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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