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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 63,890	$ 103,470	$ 134,740	$ 207,764
Less: dividends and undistributed earnings allocated to unvested restricted stock units (“RSUs”)	103	204	208	509
Net income allocated to common stockholders	$ 63,787	$ 103,266	$ 134,532	$ 207,255
Basic weighted-average shares	106,437	106,445	107,400	106,099
Effect of dilutive employee stock options and RSUs	2,000	2,264	2,090	2,144
Diluted weighted-average shares	108,437	108,709	109,490	108,243
Basic	$ 0.60	$ 0.97	$ 1.25	$ 1.95
Diluted	$ 0.59	$ 0.95	$ 1.23	$ 1.92