Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Options to purchase shares that were not included in the respective computation of diluted EPS because their inclusion would have had an antidilutive effect	60,300	2,542,277	6,302,302
Options to purchase shares that were not included in the respective computation of diluted EPS because their inclusion would have had an antidilutive effect, weighted average exercise prices	$ 17.99	$ 16.86	$ 16.30