Segment and Geographic Reporting - Additional Information (Detail) |
9 Months Ended |
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Sep. 30, 2018
Segment
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| Segment Reporting [Abstract] | |
| Number of reportable segments | 3 |
| X | ||||||||||
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
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| X | ||||||||||
- References No definition available.
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