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Recent Accounting Developments - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]      
Increase in right of use asset due to adopting new standard $ 4,900    
Other assets 30,488   $ 23,060
Increase in lease liability due to adopting new standard $ 5,269    
ASU 2016-02 [Member]      
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]      
Increase in right of use asset due to adopting new standard   $ 5,200  
Other assets   300  
Increase in lease liability due to adopting new standard   $ 5,500