| **CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)In Thousands, except Per Share data**          | 3 Months Ended | 6 Months Ended |
|-----------------------------------------------------------------------------------------------|----------------|----------------|
||
| **CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]**                                          | Â              | Â              | Â | Â |
| Revenue                                                                                       | $ 1,322,255    | $ 516,137      | $ 2,668,952 | $ 1,035,986 |
| **Operating expenses:**                                                                       | Â              | Â              | Â | Â |
| Network access expenses                                                                       | 126,629        | 53,139         | 277,913 | 106,682 |
| Other operating expenses                                                                      | 578,096        | 189,649        | 1,158,436 | 382,674 |
| Depreciation and amortization                                                                 | 358,986        | 99,974         | 710,243 | 201,023 |
| Acquisition and integration costs                                                             | 20,264         | 36,964         | 33,487 | 47,334 |
| Total operating expenses                                                                      | 1,083,975      | 379,726        | 2,180,079 | 737,713 |
| Operating income                                                                              | 238,280        | 136,411        | 488,873 | 298,273 |
| Investment income                                                                             | 175            | 3,500          | 3,290 | 5,997 |
| Other income (loss), net                                                                      | (557)          | 6,334          | 5,913 | 11,290 |
| Interest expense                                                                              | 166,864        | 93,968         | 334,279 | 187,755 |
| Income before income taxes                                                                    | 71,034         | 52,277         | 163,797 | 127,805 |
| Income tax expense                                                                            | 37,190         | 16,338         | 73,757 | 48,394 |
| Net income                                                                                    | 33,844         | 35,939         | 90,040 | 79,411 |
| Less: Income attributable to the noncontrolling interest in a partnership                     | 1,583          | 818            | 3,068 | 1,725 |
| Net income attributable to common shareholders of Frontier                                    | $ 32,261       | $ 35,121       | $ 86,972 | $ 77,686 |
| Basic and diluted net income per common share attributable to common shareholders of Frontier | $ 0.03         | $ 0.11         | $ 0.09 | $ 0.25 |

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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Acquisition-related costs and integration costs incurred to effect a business combination which costs have been expensed during the period. Acquisition costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees. Integration costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.
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| - Definition
The amount of net income or loss for the period per each share of common stock outstanding and dilutive common stock equivalents outstanding during the reporting period.
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| - Definition
Total costs related to services rendered by an entity during the reporting period.
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| - Definition
The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.
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| - Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
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| - Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.
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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.
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The cost of borrowed funds accounted for as interest that was charged against earnings during the period.
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| - Definition
This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income.
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| - Definition
Amount of net Income or Loss for the period allocated to noncontrolling partners of a limited partnership included in the entity's consolidated financial statements.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.
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The net result for the period of deducting operating expenses from operating revenues.
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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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| - Definition
The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.
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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.
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