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Asset Disposals - Additional Information (Detail)
$ in Millions
3 Months Ended
Jun. 30, 2017
Aircraft
Mar. 31, 2017
Aircraft
Jun. 30, 2016
USD ($)
Aircraft
Mar. 31, 2016
USD ($)
Aircraft
Assets Held For Sale And Impairments [Line Items]        
Number of aircraft sold   0    
Cash realized from sale of assets | $     $ 10.1 $ 0.9
Gain (loss) on disposal of assets | $     $ 4.3 $ 0.4
Oil and Gas [Member] | Light Aircraft [Member]        
Assets Held For Sale And Impairments [Line Items]        
Number of aircraft sold     4 1
Oil and Gas [Member] | Medium Aircraft [Member]        
Assets Held For Sale And Impairments [Line Items]        
Number of aircraft sold 5   3