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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders’ (deficit) equity	$ (1,370,568)		$ (1,370,568)			$ (1,523,874)
Foreign currency translation adjustment, net of tax	8,242	$ (2,763)	17,826	$ (2,746)
Foreign currency translation adjustment, tax	2,663		5,735
Accumulated other comprehensive income, net of tax	4,594		$ 4,594		$ 22,420	18,407
Activation fee revenue recognition period			1 month
Accumulated deficit	(2,647,277)		$ (2,647,277)		(3,229,070)	(3,243,473)
Adjustments Due to ASU 2018-02
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax					4,013
Accumulated deficit					(4,013)
Adjustments Due to ASU 2014-09 \| Impact of Adopting ASU 2014-09
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax					0
Accumulated deficit					18,416
Adjustments Due to ASU 2014-09 \| Impact of Adopting ASU 2014-09 \| Activation Fees
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reduction in deferred revenue					8,260
Accumulated deficit					8,260
Adjustments Due to ASU 2014-09 \| Impact of Adopting ASU 2014-09 \| Loyalty Payments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated deficit					10,156
Prepaid expenses and other current assets					$ 10,156
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders’ (deficit) equity	$ 4,594		$ 4,594			$ 18,407