Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Equity - Summary of Dividends Declared by Board of Directors (Detail) - $ / shares
 12 Months Ended
Jan. 07, 2016
Oct. 08, 2015
Jul. 09, 2015
Apr. 09, 2015
Jan. 09, 2015
Oct. 09, 2014
Jul. 10, 2014
Apr. 09, 2014
Dec. 31, 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
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
12/30/15 Record Date [Member] | Subsequent Event [Member]                  
Dividends Payable [Line Items]                  
Amount per share $ 0.30