Savings Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Employees eligible compensation deferral for 401(k) Plan	60.00%
401(k) Plan, employer matching percentage for the first 3% of participants' contribution	100.00%
401(k) Plan, employer matching percentage for the second 20% of participants' contribution	3.00%
401(k) Plan, employer matching percentage for the second 2% of participants' contribution	50.00%
401(k) Plan, employer matching percentage for the next 50% of participants' contribution	2.00%
Employer 401 K matching contribution to employee maximum	4.00%
Contribution to the 401k Plan	$ 1.7	$ 1.5	$ 1.4

Deferred Compensation Arrangement with Individual, Contributions by Plan Participants, Percentage of Salary, Maximum

No definition available.

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Employer matching contribution of fifty percent of the employee contribution.

No definition available.

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Additional level of matching contribution by employer for employee retirement plan.

No definition available.

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The maximum matching contribution by employer for employee retirement plan.

No definition available.

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Employer matching contribution of one hundred percent of the employee contribution.

No definition available.

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Initial matching contribution by employer for employee retirement plan.

No definition available.

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No definition available.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

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