Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Additional Information (Detail)

v2.4.1.9
Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Intangible Assets Disclosure [Abstract]      
Other intangible assets not subject to amortization $ 4,500,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill   $ 4,500,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Amortization of intangible assets $ 8,706,000us-gaap_AmortizationOfIntangibleAssets $ 8,245,000us-gaap_AmortizationOfIntangibleAssets