Stock Incentive Plans - Summary of Information Concerning Stock Option Awards (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted Average Price per Share, Options outstanding at beginning of year	$ 13.21	$ 14.93	$ 14.28
Weighted Average Price per Share, Assumed from acquisition	$ 11.16	$ 10.41
Weighted Average Price per Share, Exercised	$ 7.46	$ 8.87	$ 2.68
Weighted Average Price per Share, Forfeited	$ 15.58	$ 13.32	$ 12.67
Weighted Average Price per Share, Options outstanding and exercisable at end of year	$ 11.51	$ 13.21	$ 14.93
Shares, Options outstanding at beginning of year	640,050	586,020	770,610
Shares, Assumed from acquisition	274,964	627,808
Shares, Exercised	(69,429)	(182,188)	(8,389)
Shares, Forfeited	(312,061)	(391,590)	(176,201)
Shares, Options outstanding and exercisable at end of year	533,524	640,050	586,020