Per Share Information (Basic And Diluted Earnings Per Share) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
NET INCOME:
Net income attributable to common stock	$ 96,398	$ 51,994	$ 207,643	$ 66,201
WEIGHTED AVERAGE SHARES:
Weighted average shares outstanding for basic earnings per share	213,150	210,583	212,564	213,400
Effect of dilutive stock options	92	109	86	128
Effect of shares in escrow				527
Weighted average shares outstanding for diluted earnings per share	213,242	210,692	212,650	214,055

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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- Definition

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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