Reconciliation of Shares Used in Calculating Basic and Diluted Earnings Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Basic weighted average shares outstanding	105,394	111,239	109,221	113,460
Effect of common stock equivalents-stock options and non-vested stock under employee compensation plans	573	973	1,026	1,162
Diluted weighted average shares outstanding	105,967	112,212	110,247	114,622
Weighted average anti-dilutive common stock equivalents	4,487	4,486	5,023	5,234