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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 10,695 $ 10,977 $ 32,786 $ 34,946
Amortization income from unfavorable lease commitments     $ 665 $ 588