Information Regarding Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, unless otherwise specified	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]
Basic shares used in the calculation of earnings per share	44.1	44.7	45.2
Diluted shares used in the calculation of earnings per share	44.9	45.3	45.8
Per share effect of dilutive securities on income from continuing operations	$ (0.11)	$ (0.01)	$ (0.01)
Per share effect of dilutive securities on net income	$ (0.11)	$ (0.02)	$ (0.01)
Employee Stock Option
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of securities	0.3	0.2	0.2
Non-Vested Stock Grants
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of securities	0.5	0.4	0.4