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Derivative Instruments and Hedging Activities - Pre-tax Effects of Derivative Instruments on Consolidated Statements of Income and Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Derivative [Line Items]    
Amount of Gain (Loss) Recognized in OCI on Derivatives $ (57)  
Derivatives in Cash Flow Hedging Relationships [Member]    
Derivative [Line Items]    
Amount of Gain (Loss) Recognized in OCI on Derivatives (1,759) $ 3,079
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income 1,371 1,236
Derivatives in Cash Flow Hedging Relationships [Member] | Interest Rate Swaps [Member]    
Derivative [Line Items]    
Amount of Gain (Loss) Recognized in OCI on Derivatives (1,702) 3,079
Derivatives in Cash Flow Hedging Relationships [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]    
Derivative [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income $ 1,371 $ 1,236