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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018
Accumulated Other Comprehensive Income [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Cumulative adjustment upon adoption of ASU 2018-02 | $ 356 | $ 356

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- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
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- Definition Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings tax effect. + References No definition available. + Details
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- Details
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