Other Balance Sheet and Statement of Operations Information Additional Detail (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Disclosure Additional Balance Sheet Information And Statement Of Operations Additional Information [Abstract]
Remaining ownership interest	33.00%
Minimum Exercise Price	$ 46.0

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

No definition available.

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