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Assumptions Used to Estimate Fair Value of Stock Options Granted (Detail)
12 Months Ended
Dec. 31, 2016
ExecutiveOfficers
[1]
Dec. 31, 2015
Employee
ExecutiveOfficers
Dec. 31, 2014
Employee
ExecutiveOfficers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 0.00% 0.00% 0.00%
Expected volatility, Minimum 38.00% 33.00% 33.00%
Expected volatility, Maximum 49.00% 49.00% 52.00%
Risk-free interest rate, Minimum 0.50% 0.20% 0.10%
Risk-free interest rate, Maximum 2.40% 2.40% 2.50%
Expected forfeiture (employees)   10.00% 10.00%
Expected forfeiture (executives) 5.00% 5.00% 5.00%
Contractual term of up to 10 years 10 years 10 years
Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Suboptimal exercise multiple | Employee   2.1 2.1
Executives      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Suboptimal exercise multiple | ExecutiveOfficers 2.4 2.4 2.4
[1] During 2016, the Company did not grant stock options nor SARs to its employees.