Employee Benefit Plans - Summary of Restricted Stock Units Outstanding (Detail) - Restricted Stock Units Outstanding [Member] shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Underlying Restricted Stock Units, Vested and expected to vest | shares	3,606
Weighted Average Remaining Vesting Period (Years), Vested and expected to vest	7 months 12 days
Aggregate Fair Value, Vested and expected to vest | $	$ 18,031