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Derivative Financial Instruments - Summary of Aggregate Amount and Estimated Net Fair Value of Derivative Instruments (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	$ 400,000,000	$ 400,000,000
Fair Value of Assets	5,327,000	8,307,000
Fair Value of Liabilities	1,460,000
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	3,522,000	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	1,805,000	$ 3,556,000
Fair Value of Liabilities	$ 1,460,000

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Derivative assets included in accounts receivable and other assets.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
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- Definition

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

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-SubTopic 10
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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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-SubTopic 20
-Section 55
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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