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Financial Instruments - Additional Information (Detail) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) Derivative | Dec. 31, 2014 USD ($) Derivative
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Carrying amount of notes | $ 356.8 | $ 358.2
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | (2.7) |
Designated As Hedging Instrument |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Aggregate notional amount | $ 79.3 | $ 530.0
Interest Rate Swap [Member] |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Derivative maturity date | Sep. 01, 2017 |
Derivative fixed interest rate | 2.80% |
Interest Rate Swap [Member] | Designated As Hedging Instrument |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Number of interest rate derivatives held | Derivative | 1 | 9
Fair Value, Measurements, Recurring [Member] |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Fair value of swap, net liability | $ 3.4 | $ 4.3
Level 3 [Member] |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Approximate fair value of notes | 360.4 | 362.2
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Fair value of swap, net liability | $ 0.0 | $ 0.0

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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 Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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