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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% |

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- 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 + Details
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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. + Details
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