Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets (Detail)

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Goodwill and Other Intangible Assets (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
division
Jun. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]        
Number of internal divisions | division     2  
Amortization of intangible assets | $ $ 10,507 $ 6,494 $ 20,912 $ 13,056