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Derivative Financial Instruments - Summary of Aggregate Amount and Estimated Net Fair Value of Derivative Instruments (Detail) - USD ($)	Sep. 30, 2019	May 09, 2019	Dec. 31, 2018
Derivative Instruments Gain Loss [Line Items]
Fair Value of Assets	$ 982,000		$ 8,307,000
Fair Value of Liabilities	12,415,000
Cash Flow Hedge
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	400,000,000		400,000,000
Fair Value of Assets	982,000
Fair Value of Liabilities	12,415,000
Fair Value of Assets			8,307,000
Cash Flow Hedge | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	150,000,000		150,000,000
Fair Value of Assets	982,000		4,751,000
Cash Flow Hedge | Interest Rate Collar
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	250,000,000		250,000,000
Fair Value of Assets			$ 3,556,000
Fair Value of Liabilities	6,617,000
Cash Flow Hedge | Forward Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount		$ 150,000,000
Fair Value of Liabilities	$ 5,798,000

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Derivative assets included in accounts receivable and other assets.

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Fair value of all asset derivatives designated as cash flow hedging instruments.

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Fair value of all liability derivatives designated as cash flow hedging instruments.

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