Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements Of Operations And Comprehensive Income) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 918,648	$ 738,257
Costs of revenue, excluding depreciation and amortization	791,499	652,247
Depreciation and amortization	31,753	20,954
General and administrative expenses	48,885	37,304
Interest expense (income), net	10,045	8,951
Loss on extinguishment of debt	5,624	0
Other (income) expense, net	(826)	(461)
Income (loss) from continuing operations before provision for income taxes	31,668	19,499
(Provision for) benefit from income taxes	(12,348)	(7,804)
Income (loss) from continuing operations before non-controlling interests	19,320	11,695
(Loss) income from discontinued operations, net of tax	(947)	2,475
Equity in income from subsidiaries, net of tax	0	0
Net income (loss)	18,373	14,170
Net income (loss) attributable to non-controlling interests	3	(2)
Net income attributable to MasTec, Inc.	18,370	14,172
Comprehensive income (loss)	17,770	15,539
Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	918,600	738,300
Depreciation and amortization	31,753	20,717
Interest expense (income), net	10,000	9,000
MasTec, Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0
Costs of revenue, excluding depreciation and amortization	0	0
General and administrative expenses	331	108
Interest expense (income), net	0	0
Loss on extinguishment of debt	0
Other (income) expense, net	0	0
Income (loss) from continuing operations before provision for income taxes	(331)	(108)
(Provision for) benefit from income taxes	(132)	44
Income (loss) from continuing operations before non-controlling interests	(463)	(64)
(Loss) income from discontinued operations, net of tax	0	0
Equity in income from subsidiaries, net of tax	18,837	14,234
Net income (loss)	18,374	14,170
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to MasTec, Inc.	18,374	14,170
Comprehensive income (loss)	18,374	14,170
MasTec, Inc. [Member] | Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	854,524	670,557
Costs of revenue, excluding depreciation and amortization	735,801	593,750
General and administrative expenses	46,060	34,833
Interest expense (income), net	10,047	8,954
Loss on extinguishment of debt	5,624
Other (income) expense, net	(836)	(465)
Income (loss) from continuing operations before provision for income taxes	26,698	13,335
(Provision for) benefit from income taxes	(10,113)	(6,170)
Income (loss) from continuing operations before non-controlling interests	16,585	7,165
(Loss) income from discontinued operations, net of tax	(730)	3,245
Equity in income from subsidiaries, net of tax	0	0
Net income (loss)	15,855	10,410
Net income (loss) attributable to non-controlling interests	3	0
Net income attributable to MasTec, Inc.	15,852	10,410
Comprehensive income (loss)	16,076	10,656
Guarantor Subsidiaries [Member] | Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization	31,130	20,150
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	64,124	67,700
Costs of revenue, excluding depreciation and amortization	55,698	58,497
General and administrative expenses	2,494	2,363
Interest expense (income), net	(2)	(3)
Loss on extinguishment of debt	0
Other (income) expense, net	10	4
Income (loss) from continuing operations before provision for income taxes	5,301	6,272
(Provision for) benefit from income taxes	(2,103)	(1,678)
Income (loss) from continuing operations before non-controlling interests	3,198	4,594
(Loss) income from discontinued operations, net of tax	(217)	(770)
Equity in income from subsidiaries, net of tax	0	0
Net income (loss)	2,981	3,824
Net income (loss) attributable to non-controlling interests	0	(2)
Net income attributable to MasTec, Inc.	2,981	3,826
Comprehensive income (loss)	2,157	4,947
Non-Guarantor Subsidiaries [Member] | Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization	623	567
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0
Costs of revenue, excluding depreciation and amortization	0	0
General and administrative expenses	0	0
Interest expense (income), net	0	0
Loss on extinguishment of debt	0
Other (income) expense, net	0	0
Income (loss) from continuing operations before provision for income taxes	0	0
(Provision for) benefit from income taxes	0	0
Income (loss) from continuing operations before non-controlling interests	0	0
(Loss) income from discontinued operations, net of tax	0	0
Equity in income from subsidiaries, net of tax	(18,837)	(14,234)
Net income (loss)	(18,837)	(14,234)
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to MasTec, Inc.	(18,837)	(14,234)
Comprehensive income (loss)	(18,837)	(14,234)
Consolidation, Eliminations [Member] | Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization	$ 0	$ 0