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Goodwill and Other Intangible Assets Other Intangible Assets, Changes in Net Carrying Amount (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Other Intangible Assets, Gross Amount [Roll Forward]      
Other intangible assets, beginning of period     $ 124,093
Intangible assets acquired during the period     13,695
Foreign currency translation effect on balances     (4,667)
Other intangible assets, end of period $ 133,121   133,121
Other Intangible Assets, Accumulated Amortization [Roll Forward]      
Other intangible assets, beginning of period     (23,158)
Amortization expense (2,913) $ (2,963) (5,667)
Foreign currency translation effect on balances     1,154
Other intangible assets, end of period $ (27,671)   $ (27,671)