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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Cumulative adjustment upon adoption of ASU 2018-02	$ 0
Accumulated Other Comprehensive Income [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative adjustment upon adoption of ASU 2018-02	$ 356

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- Definition

Summary Of Significant Accounting Policies [Line Items]

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- Definition

Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings tax effect.

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