Earnings Per Share (Schedule of Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 75,542	$ 80,705	$ 206,520	$ 153,023
Less: dividends and undistributed earnings allocated to unvested restricted stock units (“RSUs”)	68	189	230	361
Net income allocated to common stockholders	$ 75,474	$ 80,516	$ 206,290	$ 152,662
Basic weighted-average shares	108,647	107,136	108,284	106,727
Effect of dilutive employee stock options and RSUs	1,357	1,727	1,422	1,819
Diluted weighted-average shares	110,004	108,863	109,706	108,546
Basic	$ 0.69	$ 0.75	$ 1.91	$ 1.43
Diluted	$ 0.69	$ 0.74	$ 1.88	$ 1.41