Business Segment Information - Additional Information (Detail)	Mar. 31, 2013 Country
Segment Reporting [Abstract]
Production in number of countries	6

The number of countries in which the entity operates as of balance sheet date.

No definition available.

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant