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Unaudited Condensed Consolidated Financial Statements - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Operating lease ROU asset $ 5,823   $ 0
Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Operating lease ROU asset   $ 5,893  
Operating lease liability   5,893  
Cumulative effect adjustment to the corporation’s retained earnings   $ 0