Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Additional Information (Detail)

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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 8,731 $ 8,202 $ 17,024 $ 16,035