General - Additional Information (Detail) |
6 Months Ended |
|---|---|
Jun. 30, 2017 | |
| Organization Consolidation And Presentation Of Financial Statements [Abstract] | |
| Derivative effective dates | Aug. 12, 2015 |
| X | ||||||||||
- Definition Derivative effective dates. No definition available.
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| X | ||||||||||
- References No definition available.
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