XML 84 R75.htm IDEA: XBRL DOCUMENT v3.8.0.1
Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Oct. 17, 2017
Nov. 15, 2017
Scenario Forecast [Member]    
Subsequent Event [Line Items]    
Quarterly dividend payable subsequent to balance sheet date   $ 4.3
Subsequent Events [Member]    
Subsequent Event [Line Items]    
Dividend declaration date Oct. 17, 2017  
Common stock dividends per share declared $ 0.09  
Dividend record date Nov. 01, 2017  
Dividend payment date Nov. 15, 2017