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Net Income Per Common Share (Details) (USD $)
In Thousands, except Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Net income used for basic and diluted earnings per common share [Abstract]    
Net income attributable to common shareholders of Frontier$ 20,395$ 28,995$ 107,367$ 106,681
Less: Dividends paid on unvested restricted stock awards(914)(865)(2,835)(2,240)
Total basic and diluted net income attributable to common shareholders of Frontier$ 19,481$ 28,130$ 104,532$ 104,441
Basic earnings per common share [Abstract]    
Total weighted average shares and unvested restricted stock awards outstanding - basic (in shares)995,188,000993,056,000994,642,000585,049,000
Less: Weighted average unvested restricted stock awards (in shares)(4,929,000)(4,111,000)(4,917,000)(3,180,000)
Total weighted average shares outstanding - basic (in shares)990,259,000988,945,000989,725,000581,869,000
Net income per share attributable to common shareholders of Frontier (in dollars per share)$ 0.02$ 0.03$ 0.11$ 0.18
Diluted earnings per common share [Abstract]    
Total weighted average shares outstanding - basic (in shares)990,259,000988,945,000989,725,000581,869,000
Effect of dilutive shares (in shares)535,000855,0001,478,000250,000
Effect of dilutive stock units (in shares)490,0000490,0000
Total weighted average shares outstanding - diluted (in shares)991,284,000989,800,000991,693,000582,119,000
Net income per share attributable to common shareholders of Frontier (in dollars per share)$ 0.02$ 0.03$ 0.11$ 0.18
Employee Stock Option [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the computation of diluted earnings per share (in shares)930,0003,429,000930,0003,429,000
Exercise price range of stock options related to employee compensation plans - lower range limit (in dollars per share)$ 8.19$ 8.19$ 8.19$ 8.19
Exercise price range of stock options related to employee compensation plans - upper range limit (in dollars per share)$ 14.15$ 18.46$ 14.15$ 18.46
Non-Employee Directors' Deferred Fee Plan and Equity Plan [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the computation of diluted earnings per share (in shares)  490,018388,722