Goodwill and Other Intangible Assets Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Dec. 31, 2013
Disclosure Goodwill And Other Intangible Assets Additional Information [Abstract]
Goodwill	$ 123,502		$ 123,502	$ 126,697
Total other intangible assets, net	100,941		100,941	103,011
Amortization expense of intangible assets	3,029	2,727	8,737
Estimated Future Amortization Expense by Fiscal Year [Abstract]
Remainder of 2014	3,000		3,000
2015	11,300		11,300
2016	11,300		11,300
2017	10,900		10,900
2018	9,300		9,300
2019	8,000		8,000
After 2019	$ 2,900		$ 2,900