• Filing Date: 2019-03-08
  • Form Type: 10-K
  • Description: Annual report
v3.10.0.1
Stockholders' Equity (Common Stock) - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Stock repurchased and retired, total costs $ 1,151 $ 21,318 $ 464
Common Stock [Member]      
Class of Stock [Line Items]      
Repurchase and retirement of common stock, shares 27,281 437,240 14,934
2018 Plan [Member]      
Class of Stock [Line Items]      
Common stock repurchase authorized amount $ 20,000    
Time through the company is allowed to repurchase shares Dec. 31, 2019    
Share Repurchase Plan [Member]      
Class of Stock [Line Items]      
Stock repurchased and retired, total costs $ 20,015 $ 15,154 $ 20,026
Share Repurchase Plan [Member] | Common Stock [Member]      
Class of Stock [Line Items]      
Repurchase and retirement of common stock, shares 511,628 433,175 643,703
Share Repurchase Plan [Member] | 2017 and 2016 Plan [Member]      
Class of Stock [Line Items]      
Common stock repurchase authorized amount   $ 20,000 $ 20,000
Common stock repurchased and retired, weighted average price $ 39.09 $ 34.94  
Stock repurchased and retired, total costs $ 20,015 $ 15,155  
Fees and commissions average price repurchase common stock $ 39.12 $ 34.98  
Share Repurchase Plan [Member] | 2017 and 2016 Plan [Member] | Common Stock [Member]      
Class of Stock [Line Items]      
Repurchase and retirement of common stock, shares 511,628 433,175