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Interest Rate Caps - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |
Notional amount of interest rate cap | $ 250,000,000 |
Strike rate | 2.50% |
London Interbank Offered Rate (LIBOR) [Member] |  |
Derivative [Line Items] |  |
Interest rate | 1.56% | 0.77%
Interest Rate Cap Contracts Expiring in April 2018 [Member] |  |
Derivative [Line Items] |  |
Notional amount of interest rate cap | $ 150,000,000 |
Maturity period of interest rate caps exchanged | Apr. 30, 2018 |
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 |
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 |

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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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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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