Share-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Recognized share-based compensation awards	$ 375,000	$ 215,000	$ 750,000	$ 373,000
Weighted-average fair value of stock options granted			$ 6.94	$ 5.78
Expected Volatility Rate			56.00%	58.00%
Expected Term Period			6 years 2 months 12 days	6 years 2 months 12 days
Risk-Free Interest Rate			2.20%	1.30%
Expected dividend rate			1.60%	1.60%
Cash received from employees and directors stock option exercised			800,000	400,000
Intrinsic value of option exercised			$ 1,200,000	$ 400,000