Reconciliation of Shares Used in Calculating Basic and Diluted Earnings Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Basic weighted average shares outstanding	110,932	112,937	111,166	114,568
Effect of common stock equivalents-stock options and non-vested stock under employee compensation plans	1,005	1,101	1,253	1,257
Diluted weighted average shares outstanding	111,937	114,038	112,419	115,825
Weighted average anti-dilutive common stock equivalents	4,956	5,675	6,008	5,608