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Weighted Average Shares - Calculation of Weighted-Average Shares (Detail)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]      
Basic weighted-average common shares outstanding 86,946 [1] 85,666 [1] 83,718 [1]
Effect of dilutive stock options 1,955 1,614 1,806
Diluted weighted-average common and common-equivalent shares outstanding 88,901 [1] 87,280 [1] 85,524 [1]
[1] Prior period results have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the third quarter of 2013.