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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 80,705	$ 63,890	$ 153,023	$ 134,740
Less: dividends and undistributed earnings allocated to unvested restricted stock units (“RSUs”)	189	103	361	208
Net income allocated to common stockholders	$ 80,516	$ 63,787	$ 152,662	$ 134,532
Basic weighted-average shares	107,136	106,437	106,727	107,400
Effect of dilutive employee stock options and RSUs	1,727	2,000	1,819	2,090
Diluted weighted-average shares	108,863	108,437	108,546	109,490
Basic	$ 0.75	$ 0.60	$ 1.43	$ 1.25
Diluted	$ 0.74	$ 0.59	$ 1.41	$ 1.23