Quarterly report pursuant to Section 13 or 15(d)

Per Share Information - Basic and Diluted Earnings Per Share (Detail)

v2.4.0.8
Per Share Information - Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Amounts attributable to common stock:        
Net income attributable to common stock $ 81,082 $ 70,237 $ 135,490 $ 142,318
Weighted average shares:        
Weighted average shares outstanding for basic earnings per share 219,612 214,314 219,345 213,833
Effect of dilutive stock options 30 54 30 53
Weighted average shares outstanding for diluted earnings per share 219,642 214,368 219,375 213,886