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Common Stock - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Oct. 30, 2014
Common Stock Disclosure [Line Items]      
Common stock, repurchases authorized     $ 500,000,000
Common stock, repurchased during the period $ 59,000,000 $ 92,300,000