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Subsequent Event - Additional Information (Detail) - $ / shares
Jul. 10, 2018
Jul. 11, 2017
Nov. 01, 2016
Jul. 07, 2016
Subsequent Event [Line Items]        
Annual common stock dividend declared   $ 2.50 $ 2.50 $ 2.50
Dividend payable date, declared day   Jul. 11, 2017 Nov. 01, 2016 Jul. 07, 2016
Dividend payable date   Aug. 15, 2017 Dec. 13, 2016 Aug. 04, 2016
Stockholders of record date   Aug. 02, 2017 Nov. 30, 2016 Jul. 21, 2016
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Special cash dividend $ 2.00      
Annual common stock dividend declared $ 0.55      
Dividend payable date, declared day Jul. 10, 2018      
Dividend payable date Aug. 17, 2018      
Stockholders of record date Aug. 03, 2018