Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans	2
Closing sale price per share	$ 45.89	$ 30.99	$ 32.56
Term of stock options, in years	10 years
Minimum payout based on economic profit performance against target economic profit goals	0.00%
Maximum payout based on economic profit performance against target economic profit goals	150.00%
Non Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense, directors fees	$ 0.1	$ 0.2	$ 0.2
Accumulated number of stock units outstanding	56,737	62,421	89,285
Restricted stock and restricted stock units granted	23,898	41,051	39,314
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years	3 years
Share-based compensation, weighed -average period for recognition	2 years 3 months
LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	585,189	0	0
Unrecognized compensation cost	4.7
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years	3 years
Restricted stock and restricted stock units granted	181,916	461,512	30,097
Diluted earnings per share required to determine specific performance measure of stock awards	$ 0.50
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years	3 years
Share-based compensation, weighed -average period for recognition	1 year 10 months 24 days
Unrecognized compensation cost	$ 14.2
Restricted stock and restricted stock units granted	166,348	245,736	332,888
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units granted	194,517	426,064	147,843
Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and restricted stock units granted	129,849	240,134	175,828
Terms of granting restricted stock and restricted stock units	(1) the officer is still employed as of the anniversary date of the grant; and (2) the Company's cumulative diluted earnings per share for the four calendar quarters immediately preceding the vesting date exceed $0.50 per diluted share as defined in the officers' restricted stock agreement.