Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	12 Months Ended
	Mar. 03, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Goodwill and intangible assets, net			$ 87,133,000	$ 85,795,000
Other non-current assets			67,107,000	35,861,000
Depreciation expense			120,600,000	84,100,000	$ 69,400,000
Impairment charges			0	0	0
Impairments of long-lived assets			0	0	0
Research and development expense			$ 78,100,000	$ 45,900,000	50,100,000
Forward stock repurchase transaction, shares			7.2	7.2
Forward stock repurchase transactions amount	$ 140,000,000				140,000,000
Recognition of revenue increase			$ 81,184,000	$ 82,257,000	80,913,000
Recognition of equipment costs			58,554,000	48,650,000	40,558,000
Accounting Standards Update 2014-09 [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Recognition of revenue increase			53,000,000
Recognition of equipment costs			47,000,000
Recognition of contract asset			8,000,000
Recognition of revenue deductions			$ 3,000,000
Reclassifications [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Goodwill and intangible assets, net				620,000
Other non-current assets				7,773,000
Accrued airline revenue share combined with accrued liabilities				15,521,000
Deferred tax liabilities combined with other non-current liabilities				8,264,000
Accrued airline revenue share combined with other current and non-current assets and liabilities				1,815,000	439,000
Proceeds from the sale of property and equipment combined with other, net				84,000	75,000
(Increase) decrease in investing restricted cash combined with other,net				$ 224,000	$ (192,000)
3.75% Convertible Senior Notes [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Forward stock repurchase transaction, shares		7.2
Forward stock repurchase transactions amount		$ 140,000,000
Forward stock repurchase transaction, settlement date		Mar. 01, 2020
Minimum [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Warranty term			2 years
Maximum [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Warranty term			5 years
Estimated Useful Lives [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Increases in depreciation expense			$ 29,200,000
Decrease in cost of service revenue			$ 8,000,000
Increase in net loss per basic and fully diluted share			$ 0.27