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Business Segments and Major Customers - Reconciliation of Segment Profit (loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) $ 13,185 $ 15,240 $ 33,894 $ 43,916
Interest income 683 852 1,999 1,064
Interest expense (27,585) (24,848) (81,754) (58,701)
Depreciation and amortization (35,824) (26,779) (96,821) (76,042)
Amortization of deferred airborne lease incentives 10,121 7,765 28,099 20,650
Stock-based compensation expense (5,283) (5,000) (15,007) (12,986)
Adjustment to deferred financing costs       792
Loss of extinguishment of debt       (15,406)
Other income (expense) (228) (34) (322) 137
Loss before income taxes (44,931) (32,804) (129,912) (96,576)
CA-NA [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) 15,966 14,509 43,316 46,966
CA-ROW [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) (24,110) (19,924) (82,068) (62,945)
BA [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) $ 21,329 $ 20,655 $ 72,646 $ 59,895