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Employee Benefit Plans - Summary of Stock Options Outstanding (Detail) - Stock Options Outstanding [Member]
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Vested and expected to vest | shares 3,845
Weighted Average Exercise Price, Vested and expected to vest | $ / shares $ 6.06
Weighted Average Remaining Contractual Term (Years), Vested and expected to vest 2 years 9 months 18 days
Aggregate Intrinsic Value, Vested and expected to vest | $ $ 946
Number of Shares, Exercisable | shares 3,367
Weighted Average Exercise Price, Exercisable | $ / shares $ 6.21
Weighted Average Remaining Contractual Term (Years), Exercisable 2 years 7 months 6 days
Aggregate Intrinsic Value, Exercisable | $ $ 664