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Operations - Additional Information (Detail)
Dec. 17, 2018
Nature of operations [line items]  
Percentage of ownership interest held by subsidiaries in joint operations 20.00%
New markets [member]  
Nature of operations [line items]  
Percentage of ownership interest held by subsidiaries in joint operations 51.00%
Boeing company [member]  
Nature of operations [line items]  
Percentage of ownership interest held by subsidiaries in joint operations 80.00%
Boeing company [member] | New markets [member]  
Nature of operations [line items]  
Percentage of ownership interest held by subsidiaries in joint operations 49.00%