Acquisition of Ownership Interest in Joint Ventures (Parenthetical) (Detail) (IPH Unltd)	1 Months Ended
Oct. 31, 2009
IPH Unltd
Business Acquisition [Line Items]
Percentage of interest in joint venture after transaction	51.00%

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section H

Name:	us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration