Amortization Expense of Other Intangible Assets (Detail) (Other Intangible Assets, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 4,912	$ 5,026	$ 9,839	$ 10,073