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Stockholders' Equity - Schedule of Quarterly Cash Dividends to Common Stockholders (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Stockholders Equity [Line Items]    
Cash dividends declared per share $ 0.21 $ 0.63
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
Q2 2016 Declaration [Member]    
Stockholders Equity [Line Items]    
Cash dividends record date   Jun. 20, 2016
Cash dividends payable date   Jul. 01, 2016
Cash dividends declared per share   $ 0.21