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Employee Benefit Plans and Stock-based Compensation - Summary of Restricted Stock Units Outstanding (Detail) - Restricted Stock Units Outstanding [Member]
shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares Underlying Restricted Stock Units | shares 2,740
Weighted Average Remaining Vesting Period (Years) 10 months 21 days
Aggregate Fair Value | $ $ 16,250