Quarterly report pursuant to Section 13 or 15(d)

Impairment of Long-Lived Assets - Additional Information (Detail)

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Impairment of Long-Lived Assets - Additional Information (Detail)
$ in Thousands
9 Months Ended
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