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Equity - Summary of Dividend Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
First Quarter Dividend [Member]    
Dividends Payable [Line Items]    
Declaration Date Feb. 18, 2015 Feb. 12, 2014
Record Date Mar. 02, 2015 Feb. 25, 2014
Payment Date Mar. 19, 2015 Mar. 14, 2014
Dividend per share $ 0.10 $ 0.10
Second Quarter Dividend [Member]    
Dividends Payable [Line Items]    
Declaration Date May 06, 2015 May 07, 2014
Record Date May 18, 2015 May 19, 2014
Payment Date Jun. 05, 2015 Jun. 06, 2014
Dividend per share $ 0.10 $ 0.10
Third Quarter Dividend [Member]    
Dividends Payable [Line Items]    
Declaration Date Aug. 05, 2015 Aug. 06, 2014
Record Date Aug. 17, 2015 Aug. 18, 2014
Payment Date Sep. 03, 2015 Sep. 05, 2014
Dividend per share $ 0.10 $ 0.10
Fourth Quarter Dividend [Member]    
Dividends Payable [Line Items]    
Declaration Date Nov. 04, 2015 Nov. 05, 2014
Record Date Nov. 16, 2015 Nov. 17, 2014
Payment Date Dec. 04, 2015 Dec. 05, 2014
Dividend per share $ 0.10 $ 0.10