Stock Incentive Plans - Summary of Information Concerning Stock Option Awards (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Options outstanding at beginning of period	533,524	640,050
Shares, Assumed from acquisition	304,785	19,223
Shares, Exercised	(134,687)
Shares, Forfeited	(52,262)	(289,363)
Shares, Options outstanding and exercisable at end of period	651,360	369,910
Weighted Average Price per Share, Options outstanding at beginning of period	$ 11.50	$ 13.21
Weighted Average Price per Share, Assumed from acquisition	$ 5.77	$ 7.92
Weighted Average Price per Share, Exercised	$ 6.24
Weighted Average Price per Share, Forfeited	$ 25.03	$ 15.05
Weighted Average Price per Share, Options outstanding and exercisable at end of period	$ 8.82	$ 11.49