Goodwill and Other Intangible Assets Other Intangible Assets, Changes in Net Carrying Amount (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Other Intangible Assets, Gross Amount [Roll Forward]
Other intangible assets, beginning	$ 124,093	$ 116,279
Intangible assets acquired during the period	20,779	16,050
Currency translation effect on foreign balances	(6,041)	(8,236)
Other intangible assets, ending	138,831	124,093
Other Intangible Assets, Accumulated Amortization [Roll Forward]
Other intangible assets, beginning	(23,158)	(13,268)
Amortization expense	(12,136)	(11,599)
Currency translation effect on foreign balances	1,566	1,709
Other intangible assets, ending	$ (33,728)	$ (23,158)