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Leases - Summary of Additional Information About Company's Operating Leases (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Lease assets $ 25,575  
Lease liabilities $ 27,454  
Accounting Standards Update 2016-02 [Member]    
Lease assets   $ 24,100
Lease liabilities   $ 24,100