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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]          
Amortization of intangible assets $ 10,977 $ 12,452 $ 34,946 $ 22,990 $ 22,990
Amortization income from unfavorable lease commitments     $ 588