Commitments and Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Aircraft Land_Parcel
Long-term Purchase Commitment [Line Items]
Total aircraft deposits	$ 4,900
Aggregate estimated probable liability environmental matters	$ 150
Number of parcels of land exists | Land_Parcel	2
Aggregate commitments under operating leases	$ 219,600
Operational lease payable	34,700
Lease commitment for aircraft	205,000
Facility lease commitments	14,600
2017 [Member]
Long-term Purchase Commitment [Line Items]
Aggregate purchase price for aircraft	37,100
2018 [Member]
Long-term Purchase Commitment [Line Items]
Aggregate purchase price for aircraft	127,000
2019 [Member]
Long-term Purchase Commitment [Line Items]
Aggregate purchase price for aircraft	129,000
2020 [Member]
Long-term Purchase Commitment [Line Items]
Aggregate purchase price for aircraft	22,700
Heavy Aircraft [Member]
Long-term Purchase Commitment [Line Items]
Aggregate purchase price for aircraft	$ 17,000
Number of aircraft purchased | Aircraft	1
Medium Aircraft [Member] | Oil and Gas [Member]
Long-term Purchase Commitment [Line Items]
Number of aircrafts acquired under contract | Aircraft	2
Purchase commitment for aircraft	$ 17,900