Goodwill and Other Intangible Assets Other Intangible Assets, Changes in Net Carrying Amount (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015
Other Intangible Assets, Gross Amount [Roll Forward]
Other intangible assets, beginning of period			$ 124,093
Intangible assets acquired during the period			13,831
Foreign currency translation effect on balances			(4,448)
Other intangible assets, end of period	$ 133,476		133,476
Other Intangible Assets, Accumulated Amortization [Roll Forward]
Other intangible assets, beginning of period			(23,158)
Amortization expense	(3,238)	$ (3,029)	(8,905)
Foreign currency translation effect on balances			1,024
Other intangible assets, end of period	$ (31,039)		$ (31,039)