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