Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Identified Intangible Assets - Additional Information (Details)

v3.8.0.1
Goodwill and Identified Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Acquired Indefinite-lived Intangible Assets [Line Items]          
Amortization of intangible assets   $ 7,100 $ 6,300 $ 19,700 $ 18,500
Impairment of identified intangible assets   $ 0 $ 750 $ 0 $ 750
Subsequent Event | Trade names          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Impairment of identified intangible assets $ 800