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Equity (Narrative) (Detail) (USD $) | 3 Months Ended | 5 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Aug. 31, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Class of Stock [Line Items] |  |  |  |  |  |
Number of preferred Stock issued to voting trust |  |  |  | 1 |  |
Minimum number of shares that can be exchanged by exchangeable shareholders unless the number of remaining exchangeable shares registered in the name of the holder is less |  |  |  | 50,000 |  |
Treasury stock acquired |  |  |  | 289,057 | 279,565 |
Value of treasury stock acquired, cost method |  |  |  | $ 6,200,000 | $ 6,200,000 |
Aggregate authorized amount of common stock to be repurchased |  |  | 150,000,000 |  |  |
Reduction in net income as a result of non controlling interests | 4,458,000 | 3,606,000 |  | 13,004,000 | 7,407,000 |
Carrying value of the investments held by Quanta in variable interest entities | 7,345,000 |  |  | 7,345,000 |  | 7,311,000
Carrying value of the investment held by noncontrolling interest in variable interest entities | 7,345,000 |  |  | 7,345,000 |  | 7,311,000
Distributions to noncontrolling interests | 6,733,000 | 0 |  | 12,970,000 | 471,000 |
Series F Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of preferred Stock issued to voting trust | 1 |  |  | 1 |  |
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Treasury stock acquired |  |  | 8,100,000 |  |  |
Treasury Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Value of treasury stock acquired, cost method |  |  | $ 149,500,000 |  |  |

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