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Interest Rate Caps -Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional amount of interest rate cap	$ 400,000,000
London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Interest rate	2.09%	1.56%
Interest Rate Cap Contracts Expiring in March 2019 [Member]
Derivative [Line Items]
Notional amount of interest rate cap	$ 50,000,000
Maturity period of interest rate caps exchanged	Mar. 31, 2019
Strike rate	2.50%
Interest Rate Cap Contracts Expiring In April 2020 [Member]
Derivative [Line Items]
Notional amount of interest rate cap	$ 100,000,000
Maturity period of interest rate caps exchanged	Apr. 30, 2020
Strike rate	3.25%
Interest Rate Cap Contracts Expiring In June 2020 [Member]
Derivative [Line Items]
Notional amount of interest rate cap	$ 50,000,000
Maturity period of interest rate caps exchanged	Jun. 30, 2020
Strike rate	2.50%
Interest Rate Cap Contracts Expiring In April 2021 [Member]
Derivative [Line Items]
Notional amount of interest rate cap	$ 200,000,000
Maturity period of interest rate caps exchanged	Apr. 30, 2021
Strike rate	3.50%

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

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- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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