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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization of intangible assets $ 11,190 $ 12,501
Amortization income from unfavorable lease commitments $ 185 $ 177