Quarterly report pursuant to Section 13 or 15(d)

Equity - Summary of Dividends Declared by Board of Directors (Detail)

v3.5.0.2
Equity - Summary of Dividends Declared by Board of Directors (Detail) - $ / shares
 9 Months Ended
Oct. 13, 2016
Jul. 14, 2016
Apr. 07, 2016
Jan. 07, 2016
Oct. 08, 2015
Jul. 09, 2015
Apr. 09, 2015
Sep. 30, 2016
3/30/15 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Mar. 17, 2015
Record Date               Mar. 30, 2015
Pay Date               Apr. 09, 2015
Amount per share             $ 0.26  
6/30/15 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Jun. 16, 2015
Record Date               Jun. 30, 2015
Pay Date               Jul. 09, 2015
Amount per share           $ 0.26    
09/30/15 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Sep. 16, 2015
Record Date               Sep. 30, 2015
Pay Date               Oct. 08, 2015
Amount per share         $ 0.26      
12/30/15 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Dec. 15, 2015
Record Date               Dec. 30, 2015
Pay Date               Jan. 07, 2016
Amount per share       $ 0.30        
3/30/2016 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Mar. 15, 2016
Record Date               Mar. 30, 2016
Pay Date               Apr. 07, 2016
Amount per share     $ 0.30          
07/06/16 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Jun. 07, 2016
Record Date               Jul. 06, 2016
Pay Date               Jul. 14, 2016
Amount per share   $ 0.30            
10/05/16 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Sep. 15, 2016
Record Date               Oct. 05, 2016
Pay Date               Oct. 13, 2016
Subsequent Event [Member] | 10/05/16 Record Date [Member]                
Dividends Payable [Line Items]                
Amount per share $ 0.30