Basis of Presentation - Additional Information (Detail)	6 Months Ended
Jun. 30, 2012
Summary Of Significant Accounting Policies [Line Items]
Maximum number of associates	29,000
Cuba
Summary Of Significant Accounting Policies [Line Items]
Percentage of ownership in subsidiary	88.00%

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section H

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