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Share-Based Employee Compensation - Shares Authorized, Available for Future Grant and Outstanding Under Each Plans (Detail)
Dec. 31, 2018
shares
Equity Incentive Plan [Line Items]  
Authorized (in shares) 34,000,000
Available (in shares) 10,402,000
Outstanding (in shares) 3,055,000
2004 Plan  
Equity Incentive Plan [Line Items]  
Authorized (in shares) 33,000,000
Available (in shares) 9,706,000
Outstanding (in shares) 3,004,000
2013 Directors Plan  
Equity Incentive Plan [Line Items]  
Authorized (in shares) 1,000,000
Available (in shares) 696,000
Outstanding (in shares) 51,000