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Revenue from Contracts with Customers - Additional Information (Detail 1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01
Dec. 31, 2018
Minimum | Commercial | Direct Ship Parts  
Disaggregation Of Revenue [Line Items]  
Expected timing of satisfaction, period 30 days
Minimum | U.S. Government | Direct Ship Parts  
Disaggregation Of Revenue [Line Items]  
Expected timing of satisfaction, period 30 days
Maximum | Commercial | Direct Ship Parts  
Disaggregation Of Revenue [Line Items]  
Expected timing of satisfaction, period 60 days
Maximum | U.S. Government | Direct Ship Parts  
Disaggregation Of Revenue [Line Items]  
Expected timing of satisfaction, period 60 days
Maximum | U.S. Government | Services  
Disaggregation Of Revenue [Line Items]  
Expected timing of satisfaction, period 60 days