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Impairment of Long-Lived Assets - Additional Information (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($) | Sep. 30, 2016
Impairment Or Disposal Of Tangible Assets Disclosure [Abstract] |  |
Estimated aggregate fair value of long-lived assets impaired during current period | $ 5,367 |
Multiple of cash flows used to estimate fair value of long-lived asset | 6.5 | 6.5

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- Definition Estimated aggregate fair value of long lived assets impaired during current period. + References No definition available. + Details
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- Definition Represents cash flow multiple used to estimate fair value of long-lived assets evaluated for impairment during reporting period. + References No definition available. + Details
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- References No definition available. + Details
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