Subsequent Events (Details) (USD $)	0 Months Ended
	Nov. 19, 2012
Senior Secured Credit Facility, Arranged By Bank of America, Merrill Lynch, and Wells Fargo Securities, LLC [Member]
Subsequent Event [Line Items]
Term of Credit Agreement	5 years
Scenario, Forecast | Subsequent Event | Quanta's Domestic telecommunications Infrastructure Services, Subsidiaries [Member]
Subsequent Event [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price	275,000,000
Scenario, Forecast | Senior Secured Credit Facility, Arranged By Bank of America, Merrill Lynch, and Wells Fargo Securities, LLC [Member] | Subsequent Event | Quanta's Domestic telecommunications Infrastructure Services, Subsidiaries [Member]
Subsequent Event [Line Items]
Long-term debt	400,000,000