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Derivative Financial Instruments (Detail) - Not Designated as Hedging Instrument [Member]
3 Months Ended
Mar. 31, 2019
USD ($)
Derivative [Line Items]  
Notional Amount $ 250,000,000
Fair Value $ 1,978,000
139.5 notional amount [Member]  
Derivative [Line Items]  
Instrument Swap
Notional Amount $ 139,500,000
Index one month LIBOR
Maturity Date Nov. 19, 2021
Fair Value $ 1,096,000
36.7 notional amount [Member]  
Derivative [Line Items]  
Instrument Swap
Notional Amount $ 36,700,000
Index one month LIBOR
Maturity Date Nov. 19, 2021
Fair Value $ 288,000
58.8 notional amount [Member]  
Derivative [Line Items]  
Instrument Swap
Notional Amount $ 58,800,000
Index one month LIBOR
Maturity Date Nov. 19, 2021
Fair Value $ 462,000
15.0 notional amount [Member]  
Derivative [Line Items]  
Instrument Swap
Notional Amount $ 15,000,000
Index one month LIBOR
Maturity Date Nov. 19, 2021
Fair Value $ 132,000
Swap, 2.53% Interest Rate [Member] | 15.0 notional amount [Member]  
Derivative [Line Items]  
Interest Rate 3.00%
Swap, 2.49% Interest Rate [Member] | 139.5 notional amount [Member]  
Derivative [Line Items]  
Interest Rate 2.00%
Swap, 2.49% Interest Rate [Member] | 36.7 notional amount [Member]  
Derivative [Line Items]  
Interest Rate 2.00%
Swap, 2.49% Interest Rate [Member] | 58.8 notional amount [Member]  
Derivative [Line Items]  
Interest Rate 2.00%