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Business Segments and Major Customers - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Customer
Segment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
Customer
Segment Reporting Information [Line Items]      
Number of operating segments | Segment 3    
Equipment revenue $ 81,147 $ 18,911  
Transition Agreements To Airline-directed Model [Member]      
Segment Reporting Information [Line Items]      
Equipment revenue $ 45,396    
Revenue [Member] | Customer Concentration Risk [Member] | American Airlines [Member]      
Segment Reporting Information [Line Items]      
Percentage of benchmark 36.00% 23.00%  
Revenue [Member] | Customer Concentration Risk [Member] | Delta Air Lines [Member]      
Segment Reporting Information [Line Items]      
Percentage of benchmark 20.00% 25.00%  
Accounts Receivable [Member]      
Segment Reporting Information [Line Items]      
Number of customers meeting concentration risk threshold | Customer 1   1
Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Segment Reporting Information [Line Items]      
Percentage of benchmark     15.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | American Airlines [Member]      
Segment Reporting Information [Line Items]      
Percentage of benchmark 10.00%    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Other Customer One [Member]      
Segment Reporting Information [Line Items]      
Percentage of benchmark 10.00%    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | American Airlines and Other Customer One [Member]      
Segment Reporting Information [Line Items]      
Percentage of benchmark 22.00%    
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Delta Air Lines [Member]      
Segment Reporting Information [Line Items]      
Percentage of benchmark 13.00%   21.00%