Earnings Per Share (Schedule Of Reconciliation Of Basic Earnings Per Share To Diluted Earnings Per Share) (Parenthetical) (Detail) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Basic weighted average common shares outstanding	104,285	102,580	103,909	102,308
Basic weighted average common shares outstanding and participating securities	104,515	103,116	104,228	103,058
Percentage allocated to common stockholders	99.80%	99.50%	99.70%	99.30%

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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+ Details