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Savings Plan - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% |  |
401(k) Plan, employer matching percentage for the second 2% of participants' contribution | 50.00% |  |
Employer 401K, Employee Contribution matched 50 percent by Employer | 2.00% |  |
Employer 401 K Matching Contribution To Employee Maximum | 4.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 1.5 | $ 1.4 | $ 1.3

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