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Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 15 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Dec. 31, 2014
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 |  |  |
Shares outstanding |  | 198,674,187 |  | 198,674,187 |  | 198,674,187 | 210,819,790
Income attributable to the other joint venture members |  | $ 3,500,000 | $ 4,400,000 | $ 8,200,000 | $ 8,600,000 |  |
Carrying value of the investments held by Quanta in variable interest entities |  | 13,500,000 |  | 13,500,000 |  | $ 13,500,000 | $ 11,100,000
Carrying value of the investment held by noncontrolling interest in variable interest entities |  | 13,474,000 |  | 13,474,000 |  | 13,474,000 | $ 11,067,000
Distributions to non-controlling interests |  | 2,500,000 | $ 0 | 5,000,000 | $ 500,000 |  |
Maximum [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  | $ 500,000,000 |  | $ 500,000,000 |  | $ 500,000,000 |
Treasury Stock [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Treasury stock acquired |  | 5,800,000 |  | 12,500,000 |  | 15,500,000 |
Value of treasury stock acquired, cost method |  | $ 172,300,000 |  | $ 354,300,000 |  | $ 447,800,000 |
Scenario Forecast [Member] | Maximum [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased | $ 1,250,000,000 |  |  |  |  |  |
Scenario Forecast [Member] | Treasury Stock [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Treasury stock acquired | 1,800,000 |  |  |  |  |  |
Value of treasury stock acquired, cost method | $ 52,200,000 |  |  |  |  |  |
Series F Preferred Stock [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Number of preferred Stock issued to voting trust |  | 1 |  | 1 |  | 1 | 1
Series G Preferred Stock [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Number of preferred Stock issued to voting trust |  | 1 |  | 1 |  | 1 | 1
Exchangeable Shares [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Shares outstanding |  | 7,325,971 |  | 7,325,971 |  | 7,325,971 | 7,325,971
Series F- and Series G- Preferred Stock [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Exchangeable stock shares outstanding |  | 4,399,858 |  | 4,399,858 |  | 4,399,858 |
Common Stock Withheld for Settlement of Employee Tax Liabilities [Member] | Treasury Stock [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Treasury stock acquired |  |  |  | 300,000 | 300,000 |  |
Value of treasury stock acquired, cost method |  |  |  | $ 9,900,000 | $ 11,800,000 |  |

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