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Stockholders' Equity - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 21, 2014
Mar. 18, 2014
Mar. 17, 2014
Jan. 23, 2014
Mar. 31, 2014
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Jun. 20, 2014
Scenario, Forecast [Member]
Apr. 01, 2014
Subsequent Event [Member]
Mar. 31, 2014
Series A Preferred Stock [Member]
Apr. 23, 2014
Series A Preferred Stock [Member]
Subsequent Event [Member]
Class of Stock [Line Items]                        
Common stock repurchase authorized amount   $ 40,000,000                    
Time through the company is allowed to repurchase shares           Mar. 31, 2015            
Common stock repurchased and retired, shares           210,836            
Common stock repurchased and retired, weighted average exercise price           $ 37.00            
Stock repurchased and retired under the plan, total cost           7,805,000            
Settlement of stock repurchased and retired under the plan         6,987,000         818,000    
Stock repurchase program available repurchase amount           32,200,000            
Fees and commissions average price repurchase common stock           $ 37.02            
Dividends per common share declared     $ 0.275 $ 0.275   $ 0.28 $ 0.23          
Dividends per common share paid $ 0.275                      
Dividends per common share payable                 $ 0.275      
Record date of dividend payable     May 16, 2014 Feb. 21, 2014                
Date of dividend payable     Jun. 20, 2014 Mar. 21, 2014                
Dividends paid $ 3,193,000         $ 3,206,000 $ 2,493,000          
Preferred stock conversion cancellation date                     Apr. 01, 2014  
Shares of Series A Preferred converted                     100,478  
Preferred stock Dividends rate                     7.00%  
Preferred stock, outstanding                        10,206 3,386
Number of shares issued upon conversion                     100,478