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Financial Instruments Financial Instruments - Interest Rate Swap Agreements (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Derivative, Number of Instruments Held | 2 |  |
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 100.0 |  |
Net payments under derivative swap agreements | 0.8 | $ 1.4 | $ 6.2
USD Interest Rate Swap Contract One [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 50.0 |  |
Interest rate swap agreements maturity period | 2017 |  |
Derivative, Interest Rate | 1.38% |  |
USD Interest Rate Swap Contract Two [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 50.0 |  |
Interest rate swap agreements maturity period | 2017 |  |
Derivative, Interest Rate | 1.64% |  |
Us Term Loan [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Effective interest rate on term loans | 2.67% |  |
Accrued Liabilities [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Fair value of liability of total outstanding swap agreements | $ 0.2 | 0.7 |
Other Liabilities [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Fair value of liability of total outstanding swap agreements |  | $ 0.1 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Debt Instrument, Effective Interest Rate, Percentage after Interest Rate Swap + References No definition available. + Details
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- Definition Derivative, Maturity Month and Year + References No definition available. + Details
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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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- Definition The premium (cost) of a hedge, net of any cash received on settlement during the period. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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- Details
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- Details
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