Financial Instruments and Fair Value Measurements - Derivative Activity (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014 Option
Fair Value Disclosures [Abstract]
Number of option exercised	1
Net gain from option exercised	$ 0.1

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

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration