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Changes to Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Goodwill [Line Items]        
Balance at beginning of the period     $ 43,208  
Impairment $ (8,288) $ 0 (8,288) $ 0
Adjustments to goodwill for foreign currency translation     424  
Goodwill Ending Balance $ 35,344   $ 35,344