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Revenue Recognition - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Revenue Recognition [Line Items]    
Accounts receivable, payment terms and conditions Payment terms and conditions vary among the Company's revenue streams, although terms generally include a requirement of payment within 30 to 60 days of product shipment.  
Deferred revenue and customer advances $ 247,243  
Other Noncurrent Liabilities [Member]    
Revenue Recognition [Line Items]    
Deferred revenue and customer advances $ 32,000 $ 26,000