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Information about Contract Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Deferred revenue and customer advances $ 77,711   $ 83,614
Long-term deferred revenue and customer advances 32,750   $ 30,127
ASU 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Deferred revenue and customer advances 73,593 $ 76,638  
Long-term deferred revenue and customer advances 22,447 20,848  
ASU 2014-09 | Adjustments to Recognize Under Legacy GAAP      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Deferred revenue and customer advances (4,118) 1,073  
Long-term deferred revenue and customer advances $ (10,303) $ 11,902