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, 2016	Sep. 30, 2015	Sep. 30, 2016
Other Intangible Assets, Gross Amount [Roll Forward]
Other intangible assets, beginning of period			$ 138,831
Intangible assets acquired during the period			14,000
Foreign currency translation effect on balances			1,406
Other intangible assets, end of period	$ 154,237		154,237
Other Intangible Assets, Accumulated Amortization [Roll Forward]
Other intangible assets, beginning of period			(33,728)
Amortization expense	(3,747)	$ (3,238)	(10,928)
Foreign currency translation effect on balances			(427)
Other intangible assets, end of period	$ (45,083)		$ (45,083)