v3.4.0.3
Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Land_Parcel
Dec. 31, 2015
Aircraft
Dec. 31, 2014
Aircraft
Long-term Purchase Commitment [Line Items]      
Number of aircrafts delivered | Aircraft   1  
Total aircraft deposits $ 2.6    
Aggregate estimated probable liability environmental matters $ 0.2    
Number of parcels of land exists | Land_Parcel 2    
Aggregate commitments under operating leases $ 281.4    
Operational lease payable 38.6    
Lease commitment for aircraft 266.5    
Facility lease commitments 14.9    
2016 [Member]      
Long-term Purchase Commitment [Line Items]      
Aggregate purchase price for aircraft 67.8    
2017 [Member]      
Long-term Purchase Commitment [Line Items]      
Aggregate purchase price for aircraft 55.7    
2018 [Member]      
Long-term Purchase Commitment [Line Items]      
Aggregate purchase price for aircraft 127.0    
2019 [Member]      
Long-term Purchase Commitment [Line Items]      
Aggregate purchase price for aircraft 150.4    
2020 [Member]      
Long-term Purchase Commitment [Line Items]      
Aggregate purchase price for aircraft $ 22.7    
Heavy Aircraft [Member]      
Long-term Purchase Commitment [Line Items]      
Option to purchase additional number of aircrafts | Aircraft     6
Number of aircraft orders cancelled previously scheduled for delivery | Aircraft   4