Quarterly report pursuant to Section 13 or 15(d)

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

v3.3.0.814
Equity - Summary of Dividends Declared by Board of Directors (Detail) - $ / shares
 9 Months Ended
Oct. 08, 2015
Jul. 09, 2015
Apr. 09, 2015
Jan. 09, 2015
Oct. 09, 2014
Jul. 10, 2014
Apr. 09, 2014
Sep. 30, 2015
03/27/14 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Mar. 13, 2014
Record Date               Mar. 27, 2014
Pay Date               Apr. 09, 2014
Amount per share             $ 0.22  
06/27/14 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Jun. 17, 2014
Record Date               Jun. 27, 2014
Pay Date               Jul. 10, 2014
Amount per share           $ 0.22    
9/26/2014 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Sep. 16, 2014
Record Date               Sep. 26, 2014
Pay Date               Oct. 09, 2014
Amount per share         $ 0.22      
12/19/14 Record Date [Member]                
Dividends Payable [Line Items]                
Announced Date               Dec. 08, 2014
Record Date               Dec. 19, 2014
Pay Date               Jan. 09, 2015
Amount per share       $ 0.26        
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
09/30/15 Record Date [Member] | Subsequent Event [Member]                
Dividends Payable [Line Items]                
Amount per share $ 0.26