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Business, Basis of Presentation and Significant Accounting Policies (Stock-Based Compensation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Compensation Arrangement with Individuals, Share-based Payments [Line Items]      
Stock-based compensation, shares withheld for taxes and the exercise price of options (in shares) 97,389 71,620 38,650
Stock-based compensation, payments for employee tax obligations to taxing authorities (in dollars) $ 2.7 $ 1.2 $ 0.9
Stock Options [Member]      
Deferred Compensation Arrangement with Individuals, Share-based Payments [Line Items]      
Stock-based compensation awards, stock options, vested (percentage) 100.00%    
Employee Stock Purchase Plans [Member]      
Deferred Compensation Arrangement with Individuals, Share-based Payments [Line Items]      
Stock-based compensation plan, description The Company has certain employee stock purchase plans under which shares of the Company’s common stock are available for purchase by eligible employees. These plans allow qualified employees to purchase MasTec, Inc. common stock at 85% of its fair market value at the lower of (i) the date of commencement of the offering period or (ii) the last day of the exercise period, as defined in the plan documents. Through June 30, 2013, the offering period was an annual period, composed of four interim exercise periods. Effective July 1, 2013, the offering period became quarterly.    
Stock-based compensation, purchase price of common stock, percentage of fair market value 85.00%    
Stock-based compensation, fair value assumptions, method used The fair value of purchases under the Company’s employee stock purchase plans is estimated using the Black-Scholes option-pricing valuation model.    
Stock-based compensation, fair value measurements, significant assumptions The determination of fair value of stock-based awards using an option-pricing model is affected by the Company’s stock price as well as assumptions pertaining to several variables, including expected stock price volatility, the expected term of the award and the risk-free rate of interest. In the option-pricing model for the Company’s employee stock purchase plans, expected stock price volatility is based on historical volatility of the Company’s common stock. The expected term of the award is based on historical and expected exercise patterns and the risk-free rate of interest is based on U.S. Treasury yields. The Company has not paid dividends in the past, and does not anticipate paying dividends in the foreseeable future, and therefore uses an expected dividend yield of zero.    
Stock-based compensation, fair value assumptions, expected dividend rate (percentage) 0.00%    
Minimum [Member] | Restricted Shares [Member]      
Deferred Compensation Arrangement with Individuals, Share-based Payments [Line Items]      
Stock-based compensation, vesting period (in years)      
Maximum [Member] | Restricted Shares [Member]      
Deferred Compensation Arrangement with Individuals, Share-based Payments [Line Items]      
Stock-based compensation, vesting period (in years) 3 years