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Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items] |  |
Net cash (used in) provided by operating activities | $ 260,602 | $ 81,019
Cash flows (used in) provided by investing activities: |  |
Cash paid for acquisitions, net of cash acquired | (148) | (162,901)
Capital expenditures | (70,766) | (90,962)
Proceeds from sale of property and equipment | 9,763 | 12,204
Payments for investments, net | (109,299) | (1,046)
Net cash used in investing activities | (170,450) | (242,705)
Cash flows provided by (used in) financing activities: |  |
Proceeds from credit facilities | 1,329,610 | 1,319,623
Repayments of credit facilities | (1,240,122) | (955,151)
Repayments of senior convertible notes | 0 | (105,325)
Repayments of other borrowings and capital lease obligations | (51,300) | (54,100)
Repurchase of common stock | (100,000) | 0
Proceeds from stock-based awards, net of tax withholdings | 1,743 | 318
Excess tax benefit from stock-based compensation | 56 | 3,494
Payments of acquisition-related contingent consideration | (44,757) | (60,341)
Payments of financing costs | (2,435) | (1,455)
Net financing activities and advances from (to) consolidated affiliates | 0 | 0
Net cash (used in) provided by financing activities | (107,160) | 146,978
Effect of currency translation on cash | 103 | (1,152)
Net decrease in cash and cash equivalents | (16,905) | (15,860)
Cash and cash equivalents - beginning of period | 24,059 | 22,927
Cash and cash equivalents - end of period | 7,154 | 7,067
Reportable Legal Entities [Member] | MasTec, Inc. [Member] |  |
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items] |  |
Net cash (used in) provided by operating activities | (1,100) | (900)
Cash flows (used in) provided by investing activities: |  |
Cash paid for acquisitions, net of cash acquired | 0 | 0
Capital expenditures | 0 | 0
Proceeds from sale of property and equipment | 0 | 0
Payments for investments, net | 0 | 0
Net cash used in investing activities | 0 | 0
Cash flows provided by (used in) financing activities: |  |
Proceeds from credit facilities | 0 | 0
Repayments of credit facilities | 0 | 0
Repayments of senior convertible notes |  | 0
Repayments of other borrowings and capital lease obligations | 0 | 0
Repurchase of common stock | (100,000) |
Proceeds from stock-based awards, net of tax withholdings | 2,100 | 2,900
Excess tax benefit from stock-based compensation | 0 | 0
Payments of acquisition-related contingent consideration | 0 | 0
Payments of financing costs | 0 | 0
Net financing activities and advances from (to) consolidated affiliates | 99,000 | (2,000)
Net cash (used in) provided by financing activities | 1,100 | 900
Effect of currency translation on cash | 0 | 0
Net decrease in cash and cash equivalents | 0 | 0
Cash and cash equivalents - beginning of period | 0 | 0
Cash and cash equivalents - end of period | 0 | 0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items] |  |
Net cash (used in) provided by operating activities | 317,000 | 41,100
Cash flows (used in) provided by investing activities: |  |
Cash paid for acquisitions, net of cash acquired | (100) | (40,000)
Capital expenditures | (58,200) | (75,600)
Proceeds from sale of property and equipment | 8,400 | 10,300
Payments for investments, net | (109,300) | (1,000)
Net cash used in investing activities | (159,200) | (106,300)
Cash flows provided by (used in) financing activities: |  |
Proceeds from credit facilities | 827,100 | 1,122,400
Repayments of credit facilities | (747,800) | (723,200)
Repayments of senior convertible notes |  | (105,300)
Repayments of other borrowings and capital lease obligations | (36,400) | (45,400)
Repurchase of common stock | 0 |
Proceeds from stock-based awards, net of tax withholdings | (400) | (2,600)
Excess tax benefit from stock-based compensation | 100 | 3,500
Payments of acquisition-related contingent consideration | (37,300) | (60,300)
Payments of financing costs | (2,400) | (1,500)
Net financing activities and advances from (to) consolidated affiliates | (169,200) | (125,200)
Net cash (used in) provided by financing activities | (166,300) | 62,400
Effect of currency translation on cash | 0 | 0
Net decrease in cash and cash equivalents | (8,500) | (2,800)
Cash and cash equivalents - beginning of period | 18,500 | 5,400
Cash and cash equivalents - end of period | 10,000 | 2,600
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items] |  |
Net cash (used in) provided by operating activities | (55,300) | 40,800
Cash flows (used in) provided by investing activities: |  |
Cash paid for acquisitions, net of cash acquired | 0 | (122,900)
Capital expenditures | (12,600) | (15,400)
Proceeds from sale of property and equipment | 1,400 | 1,900
Payments for investments, net | 0 | 0
Net cash used in investing activities | (11,200) | (136,400)
Cash flows provided by (used in) financing activities: |  |
Proceeds from credit facilities | 502,500 | 197,200
Repayments of credit facilities | (492,300) | (232,000)
Repayments of senior convertible notes |  | 0
Repayments of other borrowings and capital lease obligations | (14,900) | (8,700)
Repurchase of common stock | 0 |
Proceeds from stock-based awards, net of tax withholdings | 0 | 0
Excess tax benefit from stock-based compensation | 0 | 0
Payments of acquisition-related contingent consideration | (7,500) | 0
Payments of financing costs | 0 | 0
Net financing activities and advances from (to) consolidated affiliates | 70,200 | 127,200
Net cash (used in) provided by financing activities | 58,000 | 83,700
Effect of currency translation on cash | 100 | (1,200)
Net decrease in cash and cash equivalents | (8,400) | (13,100)
Cash and cash equivalents - beginning of period | 5,600 | 17,600
Cash and cash equivalents - end of period | (2,800) | 4,500
Eliminations [Member] |  |
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items] |  |
Net cash (used in) provided by operating activities | 0 | 0
Cash flows (used in) provided by investing activities: |  |
Cash paid for acquisitions, net of cash acquired | 0 | 0
Capital expenditures | 0 | 0
Proceeds from sale of property and equipment | 0 | 0
Payments for investments, net | 0 | 0
Net cash used in investing activities | 0 | 0
Cash flows provided by (used in) financing activities: |  |
Proceeds from credit facilities | 0 | 0
Repayments of credit facilities | 0 | 0
Repayments of senior convertible notes |  | 0
Repayments of other borrowings and capital lease obligations | 0 | 0
Repurchase of common stock | 0 |
Proceeds from stock-based awards, net of tax withholdings | 0 | 0
Excess tax benefit from stock-based compensation | 0 | 0
Payments of acquisition-related contingent consideration | 0 | 0
Payments of financing costs | 0 | 0
Net financing activities and advances from (to) consolidated affiliates | 0 | 0
Net cash (used in) provided by financing activities | 0 | 0
Effect of currency translation on cash | 0 | 0
Net decrease in cash and cash equivalents | 0 | 0
Cash and cash equivalents - beginning of period | 0 | 0
Cash and cash equivalents - end of period | $ 0 | $ 0

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