Annual report pursuant to Section 13 and 15(d)

Intangible Assets (Narrative) (Detail)

v3.19.1
Intangible Assets (Narrative) (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 $ 15,578 $ 21,327 $ 20,703
Estimated useful life 9 years 10 months 4 days