Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Equity - Summary of Dividends Declared by Board of Directors (Detail) - $ / shares
 12 Months Ended
Jan. 12, 2017
Oct. 13, 2016
Jul. 14, 2016
Apr. 07, 2016
Jan. 07, 2016
Oct. 08, 2015
Jul. 09, 2015
Apr. 09, 2015
Dec. 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 [1]                 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
Amount per share   $ 0.30              
29/12/16 Record Date [Member]                  
Dividends Payable [Line Items]                  
Announced Date                 Dec. 13, 2016
Record Date [1]                 Dec. 29, 2016
Pay Date                 Jan. 12, 2017
Subsequent Event [Member] | 29/12/16 Record Date [Member]                  
Dividends Payable [Line Items]                  
Amount per share $ 0.33                
[1] These dividends will be treated as distributions in the following year for tax purposes.