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Derivative Instruments - Additional Information (Detail) - Other Assets - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Funds needed to post execute swap transaction $ 2.9 $ 3.1
Interest Rate Swap    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Margin calls made in connection with interest rate swaps $ 3.6 $ 9.5