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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 10,901 $ 11,468 $ 22,091 $ 23,969
Amortization income from unfavorable lease commitments     $ 370 $ 366