Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Line Items]
Less: Noncontrolling interest in subsidiaries' earnings	$ 188	$ 151
Net income attributable to common shareholders	48,684	57,791
Net income attributable to common shareholders	$ 48,872	$ 57,942
Average basic shares outstanding	58,516	57,479
Effect of dilutive stock options	998	910
Average diluted shares outstanding	59,514	58,389
Earnings per share - basic:
Net income attributable to common shareholders	$ 0.83	$ 1.01
Earnings per share - diluted:
Net income attributable to common shareholders	$ 0.82	$ 0.99