Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Equity - Summary of Dividends Declared by Board of Directors (Detail) - $ / shares
 3 Months Ended
Apr. 07, 2016
Jan. 07, 2016
Oct. 08, 2015
Jul. 09, 2015
Apr. 09, 2015
Mar. 31, 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
3/30/2016 Record Date [Member] | Subsequent Event [Member]            
Dividends Payable [Line Items]            
Amount per share $ 0.30