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Special Cash Dividends - Additional Information (Detail) - $ / shares
Jul. 11, 2017
Nov. 01, 2016
Jul. 07, 2016
Oct. 27, 2015
Jun. 29, 2017
Class of Stock [Line Items]          
Dividend payable date, declared day   Nov. 01, 2016 Jul. 07, 2016 Oct. 27, 2015  
Annual cash dividend         $ 0.50
Subsequent Event [Member]          
Class of Stock [Line Items]          
Dividend payable date, declared day Jul. 11, 2017        
Special cash dividend $ 2.00        
Annual cash dividend $ 0.50