XML 61 R51.htm IDEA: XBRL DOCUMENT v3.5.0.2
Other - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Nov. 03, 2016
Aug. 15, 2016
May 16, 2016
Feb. 15, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other [Line Items]                
Cash dividend paid   $ 608,000 $ 602,000 $ 594,000     $ 1,804,000 $ 1,557,000
Dividend payable         $ 619,000   $ 619,000  
Dividend payable date         Nov. 15, 2016      
Quarterly dividend declared         $ 0.0425 $ 0.0425 $ 0.1275 $ 0.1175
Dividend Declared | Subsequent Event                
Other [Line Items]                
Dividend payable date Feb. 15, 2017              
Dividend declaration date Nov. 03, 2016              
Quarterly dividend declared $ 0.0425              
Dividend declared, date of record Feb. 01, 2017