Capacity Purchase Agreement with United - Additional Information (Detail) - United Airlines [Member] - CRJ-200 [Member]	1 Months Ended
	Feb. 28, 2017 Aircraft
Property, Plant and Equipment [Line Items]
Date of expiration of the agreement	Feb. 01, 2023
Extension Period One [Member]
Property, Plant and Equipment [Line Items]
Period of extension of the agreement	2 years
Extension Period Two [Member]
Property, Plant and Equipment [Line Items]
Period of extension of the agreement	2 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Number of aircraft operated	65