Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Summary of significant accounting policies (Details)

v3.8.0.1
Summary of significant accounting policies (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
segment
Summary Of Significant Accounting Policies [Line Items]  
Minimum aircraft age threshold for performance of impairment assessments 5 years
Minimum period for consideration as excess inventory 4 years
Carrying value of engine and airframe parts considered excess inventory | $ $ 0
Number of operating segments 1
Number of reportable segments 1
Flight Equipment [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Estimated useful life of asset, years 25 years
Percentage of estimates for residual values of original manufacture cost 15.00%