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Segment Reporting - Reconciliation of Total Segment Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Segment Reporting [Abstract]
Total assets of all segments	$ 9,895,173	$ 9,719,938	$ 9,971,065
Cash	540,206	639,491	665,737	692,127
Accounts receivable and other assets	682,208	642,596
Assets	$ 11,117,587	$ 11,002,025

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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