Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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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- Definition

Number of forward contracts included in option contracts available to sell.

+ References

No definition available.

+ Details

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- Definition

Number of option contracts exercised.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

+ 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

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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Financial Instruments and Fair Value Measurements - Foreign Currency Contracts Activity (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) Contracts	Mar. 31, 2015 USD ($) Contracts	Mar. 31, 2016 EUR (€) $ / €	Mar. 31, 2016 GBP (£) $ / €
Derivative [Line Items]
Number of option contracts exercised	8	6
Gains from option contracts exercised \| $	$ 1.7	$ 2.2
Forward and Option Contracts [Member]
Derivative [Line Items]
Number of forward contracts included in option contracts available to sell	2
Notional value of forward contracts			€ 14,800,000	£ 11,000,000
Weighted average forward rate at March 31 \| $ / €			1.09	1.09