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Schedule of Stock Options Weighted Average Remaining Contractual Terms (Detail)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award      
Outstanding 3 years 10 months 24 days 4 years 2 months 12 days 4 years 6 months
Vested and expected to vest 3 years 10 months 24 days 4 years 2 months 12 days 4 years 6 months
Exercisable 3 years 2 months 12 days 3 years 10 months 24 days 4 years 2 months 12 days