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Stock-Based Compensation (Detail) - (Table 1)
12 Months Ended
Dec. 31, 2018
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Common stock authorized 35,199,000
Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled (34,131,866)
Common stock available for grant of stock-based awards as of June 30, 2012 1,067,134