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Stock-Based Compensation (Detail) - (Table 1) - shares
9 Months Ended
Sep. 30, 2017
May 25, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Common stock authorized   23,466,000
Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled (21,795,000)  
Common stock available for grant of stock-based awards as of June 30, 2012 1,671,000