Impairment of Long-Lived Assets - Additional Information (Detail) $ in Thousands |
9 Months Ended | |
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Sep. 30, 2018
USD ($)
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Sep. 30, 2017 |
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| Impairment Or Disposal Of Tangible Assets Disclosure [Abstract] | ||
| Estimated aggregate fair value of long-lived assets impaired during current period | $ 178 | |
| Multiple of cash flows used to estimate fair value of long-lived asset | 6.5 | 6.5 |
| X | ||||||||||
- Definition Estimated aggregate fair value of long lived assets impaired during current period. No definition available.
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| X | ||||||||||
- Definition Represents cash flow multiple used to estimate fair value of long-lived assets evaluated for impairment during reporting period. No definition available.
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| X | ||||||||||
- References No definition available.
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