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Summary of Receivables, Contract Assets and Contarct Liability from Contracts with Customers and Significant Change in Contract Assets and Contract Liabilities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Contract Assets          
Total contract assets $ 3,302   $ 3,302   $ 3,541
Contract liabilities          
Total Contract liabilities 3,542   3,542   3,240
Changes in the Contract Liabilities          
Revenue recognized that was included in the contract liability balance at the beginning of the period 2,965 $ 5,911 3,240 $ 7,973  
Revenue recognized from performance obligations satisfied in previous periods 0 0 0 0  
Changes in the Contract Assets          
Transferred to receivables from contract assets recognized at the beginning of the period 3,305 4,114 3,541 6,361  
Revenue recognized from performance obligations satisfied in previous periods 611 $ 1,715 739 $ 591  
Revenue Earned in Excess of Billings          
Contract Assets          
Total contract assets 3,302   3,302   3,541
Net Unbilled Receivables          
Contract Assets          
Total contract assets 3,302   3,302   3,541
Deferred Revenue on Uncompleted Contracts          
Contract liabilities          
Total Contract liabilities $ 3,542   $ 3,542   $ 3,240