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Financial Instruments - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Derivative	Dec. 31, 2014 USD ($) Derivative
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Carrying amount of notes	$ 437.6	$ 358.2
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	(2.5)
Designated As Hedging Instrument [Member]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Aggregate notional amount	78.5	530.0
Fair Value, Measurements, Recurring [Member]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Fair value of swap liability	2.5
Fair value of swap, net liability	$ 2.5	$ 4.3
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 [Member]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Number of interest rate derivatives held | Derivative	1	9
Level 3 [Member]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Approximate fair value of notes	$ 441.5	$ 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

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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

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

+ References

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