Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Equity - Summary of Dividends Declared by Board of Directors (Detail) - $ / shares
 3 Months Ended
Apr. 13, 2017
Jan. 12, 2017
Oct. 13, 2016
Jul. 14, 2016
Apr. 07, 2016
Mar. 31, 2017
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
Amount per share     $ 0.30      
12/29/16 Record Date [Member]            
Dividends Payable [Line Items]            
Announced Date           Dec. 13, 2016
Record Date [1]           Dec. 29, 2016
Pay Date           Jan. 12, 2017
Amount per share   $ 0.33        
4/5/2017 Record Date [Member]            
Dividends Payable [Line Items]            
Announced Date           Mar. 15, 2017
Record Date           Apr. 05, 2017
Pay Date           Apr. 13, 2017
Subsequent Event [Member] | 4/5/2017 Record Date [Member]            
Dividends Payable [Line Items]            
Amount per share $ 0.33          
[1] This dividend was treated as a distribution in 2017 for tax purposes.