XML 59 R47.htm IDEA: XBRL DOCUMENT v3.6.0.2
Nature of Business and Summary of Significant Accounting Policies - Summary of Dividends Paid Per Common Share (Detail) - $ / shares
3 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dividends [Abstract]                        
Dividends per Common Share $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09