Amortization Expense of Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 6,093	$ 4,912	$ 12,189	$ 9,839