Capital Stock - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended							12 Months Ended			1 Months Ended			1 Months Ended
	Apr. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Preferred stock Series A	Dec. 31, 2012 Preferred stock Series A	Dec. 31, 2013 Preferred stock Series B	Dec. 31, 2012 Preferred stock Series B	Dec. 31, 2013 Restricted Stock Non Employee Director	Dec. 31, 2012 Restricted Stock Non Employee Director	Dec. 31, 2011 Restricted Stock Non Employee Director	Mar. 11, 2014 Subsequent Event Dividend Declared	Dec. 31, 2013 Long Term Incentive Plan 2000	Jun. 30, 2012 Long Term Incentive Plan 2000 After Amendment	Jun. 30, 2012 Long Term Incentive Plan 2000 Minimum	Jun. 30, 2012 Long Term Incentive Plan 2000 Maximum	Jun. 30, 2012 Long Term Incentive Plan 2000 Increase
Share Based Compensation [Line Items]
Shares available for grant													643,073	4,200,000			700,000
Options expiration period															5 years	10 years
Options vesting period										1 year						5 years
Dividend declaration date												Mar. 11, 2014
Quarterly dividend declared												$ 0.0375
Dividend payable date												May 15, 2014
Dividend declared, date of record												May 01, 2014
Stock repurchase program, authorized amount	$ 10,000,000	$ 3,200,000
Stock repurchase program, authorized shares		245,575
Preferred stock, shares authorized					100	100	2,000,000	2,000,000
Preferred stock, issued
Preferred stock, outstanding
Total number of restricted shares granted									22,459	23,394	21,400
Total fair value of the restricted shares									298,000	270,000	230,000
Total intrinsic value of stock options exercised		1,997,000	1,182,000	830,400
Stock compensation expense		2,881,000	2,793,000	2,795,000
Unrecognized compensation cost		$ 3,700,000
Weighted-average recognition period		2 years 4 months 28 days
Weighted-average per share grant date fair value of stock options granted		$ 6.12	$ 6.05	$ 5.69