Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Amortization Expense of Intangibles Assets (Detail)

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Goodwill and Intangible Assets - Amortization Expense of Intangibles Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 5,928 $ 6,995 $ 7,272