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Stockholders' Equity - Schedule of Quarterly Cash Dividends to Common Stockholders (Detail) - $ / shares
3 Months Ended
Feb. 22, 2016
Jan. 05, 2016
Mar. 31, 2016
Mar. 31, 2015
Stockholders Equity [Line Items]        
Cash dividends record date Mar. 14, 2016 Jan. 15, 2016    
Cash dividends payable date Apr. 01, 2016 Jan. 22, 2016    
Cash dividends declared per share $ 0.21 $ 0.21 $ 0.42 $ 0.42
Q4 2015 Declaration [Member]        
Stockholders Equity [Line Items]        
Cash dividends record date     Jan. 15, 2016  
Cash dividends payable date     Jan. 22, 2016  
Cash dividends declared per share     $ 0.21  
Q1 2016 Declaration [Member]        
Stockholders Equity [Line Items]        
Cash dividends record date     Mar. 14, 2016  
Cash dividends payable date     Apr. 01, 2016  
Cash dividends declared per share     $ 0.21