Derivative Instruments and Hedging Activities - Additional Information (Details) - contract |
Sep. 30, 2018 |
Dec. 31, 2017 |
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| Not Designated | ||
| Derivative [Line Items] | ||
| Number of instruments held | 4 | 1 |
| X | ||||||||||
- Definition 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. No definition available.
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| X | ||||||||||
- Definition The number of derivative instruments of a particular group held by the entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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