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Derivative Financial Instruments (Detail) - Not Designated as Hedging Instrument [Member]
12 Months Ended
Dec. 31, 2019
USD ($)
Derivative [Line Items]  
Derivative, Notional Amount $ 250,000,000
Derivative Assets (Liabilities), at Fair Value, Net $ 4,385,000
139.5 notional amount [Member]  
Derivative [Line Items]  
Derivative, Type of Instrument Swap
Derivative, Notional Amount $ 139,500,000
Debt Instrument, Description of Variable Rate Basis one month LIBOR
Derivative, Maturity Date Nov. 19, 2021
Derivative Assets (Liabilities), at Fair Value, Net $ 2,441,000
58.8 notional amount [Member]  
Derivative [Line Items]  
Derivative, Type of Instrument Swap
Derivative, Notional Amount $ 58,800,000
Debt Instrument, Description of Variable Rate Basis one month LIBOR
Derivative, Maturity Date Nov. 19, 2021
Derivative Assets (Liabilities), at Fair Value, Net $ 1,029,000
36.7 notional amount [Member]  
Derivative [Line Items]  
Derivative, Type of Instrument Swap
Derivative, Notional Amount $ 36,700,000
Debt Instrument, Description of Variable Rate Basis one month LIBOR
Derivative, Maturity Date Nov. 19, 2021
Derivative Assets (Liabilities), at Fair Value, Net $ 642,000
15.0 notional amount [Member]  
Derivative [Line Items]  
Derivative, Type of Instrument Swap
Derivative, Notional Amount $ 15,000,000
Debt Instrument, Description of Variable Rate Basis one month LIBOR
Derivative, Maturity Date Nov. 19, 2021
Derivative Assets (Liabilities), at Fair Value, Net $ 273,000
Swap, 2.49% Interest Rate [Member] | 139.5 notional amount [Member]  
Derivative [Line Items]  
Derivative, Basis Spread on Variable Rate 2.49%
Swap, 2.49% Interest Rate [Member] | 58.8 notional amount [Member]  
Derivative [Line Items]  
Derivative, Basis Spread on Variable Rate 2.49%
Swap, 2.49% Interest Rate [Member] | 36.7 notional amount [Member]  
Derivative [Line Items]  
Derivative, Basis Spread on Variable Rate 2.49%
Swap, 2.53% Interest Rate [Member] | 15.0 notional amount [Member]  
Derivative [Line Items]  
Derivative, Basis Spread on Variable Rate 2.53%