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Goodwill and Other Intangible Assets Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]    
Balance as of beginning of year $ 123,031 $ 126,697
Goodwill from businesses acquired 17,010 7,456
Currency translation effect on foreign goodwill balances (9,027) (11,122)
Balance as of end of year $ 131,014 $ 123,031