Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Additional Information (Detail)

v3.10.0.1
Revenue Recognition - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Contract With Customer Assets And Liabilities [Line Items]      
Percentage of revenue from contracts recognized over time 70.00%    
Percentage of revenue from contracts recognized upon shipment 30.00%    
Revenue recognized included in contract liability $ 6,252    
Unbilled revenue (contract assets) 5,752    
Contract with customer liability increase in contract asset due to contract progress. 7,514    
Contract with customer liability offset by invoicing to customers. 1,762    
Customer deposits, current 718    
Contract with customer liability offset by new customer deposits. 5,534    
Receivables billed but not paid under retainage provisions in its customer contracts 1,230   $ 1,124
Amortization expense 40    
Revenue remaining unsatisfied performance obligations amount 114,855    
Customer Deposit [Member]      
Contract With Customer Assets And Liabilities [Line Items]      
Contract liabilities 3,762 $ 2,220  
Prepaid Expenses and Other Current Assets [Member]      
Contract With Customer Assets And Liabilities [Line Items]      
Capitalized costs, net of amortization $ 113 $ 118