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Share-Based Employee Compensation - Shares Authorized, Available for Future Grant and Outstanding Under Each Plans (Detail)
Dec. 31, 2015
shares
Equity Incentive Plan [Line Items]  
Authorized 25,000,000
Available 7,767,000
Outstanding 4,881,000
2004 Plan  
Equity Incentive Plan [Line Items]  
Authorized 24,000,000
Available 6,915,000
Outstanding 4,782,000
2013 Directors Plan  
Equity Incentive Plan [Line Items]  
Authorized 1,000,000
Available 852,000
Outstanding 99,000