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Property and Equipment - Summary of Company's Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,238,850 $ 1,192,866
Less accumulated depreciation and amortization (355,321) (315,048)
Property and equipment, net 883,529 877,818
Flight Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,096,986 1,053,640
Facility & Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 61,330 61,246
Operating Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 26,004 24,764
Data Processing Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 33,178 32,374
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 8,461 8,133
Medical Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 7,514 7,377
Other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 5,377 $ 5,332