Earnings Per Share (Schedule Of Earnings Per Share) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Line Items]
Net income attributable to the Company	$ 103,470	$ 21,043	$ 207,764	$ 38,049
Less: dividends and undistributed earnings allocated to unvested restricted stock units	204	32	509	76
Net income allocated to common stockholders	$ 103,266	$ 21,011	$ 207,255	$ 37,973
Basic weighted-average shares	106,445	105,375	106,099	105,104
Effect of dilutive employee stock options and restricted stock units	2,264	1,630	2,144	1,733
Diluted weighted-average shares	108,709	107,005	108,243	106,837
Basic	$ 0.97	$ 0.20	$ 1.95	$ 0.36
Diluted	$ 0.95	$ 0.20	$ 1.92	$ 0.36