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Derivative Financial Instruments - Summary of Aggregate Amount and Estimated Net Fair Value of Derivative Instruments (Detail) - USD ($)	Dec. 31, 2017	Nov. 17, 2017	Dec. 31, 2016	Jun. 24, 2016	Sep. 30, 2015
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	$ 250,000,000		$ 350,000,000
Fair Value of Assets	7,291,000		3,867,000
Fair Value of Assets			3,867,000
Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount				$ 150,000,000
Cash Flow Hedge
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	200,000,000		150,000,000
Fair Value of Assets	5,997,000		3,867,000
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	4,700,000		3,867,000
Cash Flow Hedge | Interest Rate Collar
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	50,000,000	$ 100,000,000
Fair Value of Assets	1,297,000
Cash Flow Hedge | Interest Rate Cap
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount					$ 200,000,000
Freestanding Derivatives | Interest Rate Collar
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	50,000,000	$ 50,000,000
Fair Value of Assets	$ 1,294,000
Freestanding Derivatives | Interest Rate Cap
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount			$ 200,000,000

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- 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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

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