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Per Share Of Common Stock - Additional Information (Detail) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share Disclosure [Line Items]      
Average diluted shares outstanding 503 666 581
Convertible Debt [Member]      
Earnings Per Share Disclosure [Line Items]      
Debt Instrument, Convertible, Conversion Price $ 11.70