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Equity - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Stockholders Equity [Line Items] |  |  |
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 |  |
Number of shares of Common stock received for each exchangeable share | 1 |  |
Exchangeable shares exchanged for common stock | 409,110 |  |
Reduction in net income as a result of non controlling interests | $ 4,776,000 | $ 4,287,000 |
Carrying value of the investments held by Quanta in variable interest entities | 4,700,000 |  | 5,400,000
Distributions to noncontrolling interests | 5,500,000 | 2,500,000 |
Carrying value of the investment held by noncontrolling interest in variable interest entities | 4,690,000 |  | 5,368,000
Series F Preferred Stock [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Number of preferred Stock issued to voting trust | 1 |  |
Common Stock Withheld for Settlement of Employee Tax Liabilities [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Treasury stock acquired | 296,874 | 283,366 |
Value of treasury stock acquired, cost method | $ 9,700,000 | $ 6,000,000 |

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