Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
Mar. 12, 2013	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]
Outstanding purchase commitments		$ 132
Purchase obligation due		$ 46
Settlement date of outstanding litigations	Apr. 23, 2013

Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

No definition available.

Name:	us-gaap_PurchaseObligationDueInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant