Share Capital (Narrative) (Detail)				1 Months Ended
Dec. 31, 2012 EUR (€)	Sep. 30, 2012 USD ($)	Dec. 31, 2011 EUR (€)	Sep. 30, 2012 Executive Shares [Member]	Sep. 30, 2012 "B" Executive Shares [Member]
Shareholders Equity [Line Items]
Shares redeemed				1,000	21,375
Executive Shares, par value	€ 1.25	$ 1.25	€ 1.25
"B" Executive Shares, par value	€ 0.05	$ 0.05	€ 0.05

Number of stock bought back by the entity at the exercise price or redemption price.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4, 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_StockRedeemedOrCalledDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration