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Summary of Redeemable Noncontrolling Interest (Parenthetical) (Detail) (B.D. Mobile)	Dec. 31, 2011
B.D. Mobile
Redeemable Noncontrolling Interest [Line Items]
Percentage of equity interest of redeemable noncontrolling shareholders	6.98%

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RedeemableNoncontrollingInterestLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration