Asset Disposals - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2016 USD ($) Aircraft	Mar. 31, 2016 USD ($) Aircraft	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)
Assets Held For Sale And Impairments [Line Items]
Cash realized from sale of assets | $	$ 10,100,000	$ 900,000
Gain (loss) on disposal of assets | $	$ 4,300,000	$ (400,000)	$ 0	$ 0
Oil and Gas [Member] | Light Aircraft [Member]
Assets Held For Sale And Impairments [Line Items]
Number of aircraft sold | Aircraft	4	1
Oil and Gas [Member] | Medium Aircraft [Member]
Assets Held For Sale And Impairments [Line Items]
Number of aircraft sold | Aircraft	3