Stock Compensation Plan - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Oct. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period range - start		1 year
Options vesting period range - end		4 years
Stock options exercisable (shares)		800	8,105	264,509
Stock compensation amortization		$ 0.2	$ 0.3	$ 1.9
Options Granted Prior To June 4, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration term		10 years
Options Granted On June 4, 2004 and thereafter
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration term		7 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards Service period, Minimum		1 year 6 months
Restricted stock awards Service period, Maximum		3 years
Restricted shares granted in period (shares)	120,000	120,000
Award vesting period		3 years
Stock compensation amortization		0.2	0.3	1.9
Deferred stock-based compensation		2.8	0
Total fair value of restricted stock and restricted stock units that vested during the period		$ 0	$ 3.7