Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements Of Operations And Comprehensive Income) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 977,624	$ 988,874	$ 1,896,272	$ 1,727,131
Costs of revenue, excluding depreciation and amortization	822,655	868,504	1,614,154	1,520,752
Depreciation and amortization			65,355	42,946
General and administrative expenses	51,900	38,374	100,785	75,678
Interest expense (income), net	11,838	9,487	21,883	18,438
Loss on extinguishment of debt	0	0	5,624	0
Other expense (income) , net	322	(366)	(504)	(827)
Income from continuing operations before provision for income taxes	57,307	51,112	88,975	70,610
Provision for (benefit from ) income taxes	(21,776)	(19,948)	(34,124)	(27,751)
Income from continuing operations before non-controlling interests	35,531	31,164	54,851	42,859
(Loss) income from discontinued operations, net of tax	(484)	(1,075)	(1,431)	1,399
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	35,047	30,089	53,420	44,258
Net income (loss) attributable to non-controlling interests	106	(3)	109	(6)
Net income attributable to MasTec, Inc.	34,941	30,092	53,311	44,264
Comprehensive income (loss)	28,408	28,799	46,179	44,338
Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	977,600	988,900	1,896,300	1,727,100
Depreciation and amortization	33,602	21,763	65,355	42,480
Interest expense (income), net	11,800	9,500	21,900	18,400
MasTec, Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0	0	0
Costs of revenue, excluding depreciation and amortization	0	0		0
General and administrative expenses	655	641	986	749
Interest expense (income), net	0	0	0	0
Loss on extinguishment of debt			0
Other expense (income) , net	0	0	0	0
Income from continuing operations before provision for income taxes	(656)	(641)	(987)	(750)
Provision for (benefit from ) income taxes	530	265	398	309
Income from continuing operations before non-controlling interests	(126)	(376)	(589)	(441)
(Loss) income from discontinued operations, net of tax	0	0	0	0
Equity in income from subsidiaries, net of tax	35,173	30,465	54,009	44,699
Net income	35,047	30,089	53,420	44,258
Net income (loss) attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	35,047	30,089	53,420	44,258
Comprehensive income (loss)	35,047	30,089	53,420	44,258
MasTec, Inc. [Member] | Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization	1	0	1	1
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	881,780	944,529	1,736,304	1,615,087
Costs of revenue, excluding depreciation and amortization	746,253	831,595	1,482,054	1,425,346
General and administrative expenses	44,300	35,283	90,360	70,115
Interest expense (income), net	11,612	9,492	21,659	18,446
Loss on extinguishment of debt			5,624
Other expense (income) , net	621	(578)	(215)	(1,042)
Income from continuing operations before provision for income taxes	48,604	47,549	75,302	60,884
Provision for (benefit from ) income taxes	(17,829)	(19,032)	(27,942)	(25,202)
Income from continuing operations before non-controlling interests	30,775	28,517	47,360	35,682
(Loss) income from discontinued operations, net of tax	118	(492)	(612)	2,752
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	30,893	28,025	46,748	38,434
Net income (loss) attributable to non-controlling interests	106	0	109	0
Net income attributable to MasTec, Inc.	30,787	28,025	46,639	38,434
Comprehensive income (loss)	30,205	27,730	46,282	38,385
Guarantor Subsidiaries [Member] | Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization	30,390	21,188	61,520	41,338
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	95,844	44,345	159,968	112,044
Costs of revenue, excluding depreciation and amortization	76,402	36,909	132,100	95,406
General and administrative expenses	6,945	2,450	9,439	4,814
Interest expense (income), net	226	(5)	224	(8)
Loss on extinguishment of debt			0
Other expense (income) , net	(299)	212	(289)	215
Income from continuing operations before provision for income taxes	9,359	4,204	14,660	10,476
Provision for (benefit from ) income taxes	(4,477)	(1,181)	(6,580)	(2,858)
Income from continuing operations before non-controlling interests	4,882	3,023	8,080	7,618
(Loss) income from discontinued operations, net of tax	(602)	(583)	(819)	(1,353)
Equity in income from subsidiaries, net of tax	0	0	0	0
Net income	4,280	2,440	7,261	6,265
Net income (loss) attributable to non-controlling interests	0	(3)	0	(6)
Net income attributable to MasTec, Inc.	4,280	2,443	7,261	6,271
Comprehensive income (loss)	(1,671)	1,445	486	6,394
Non-Guarantor Subsidiaries [Member] | Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization	3,211	575	3,834	1,141
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0	0	0
Costs of revenue, excluding depreciation and amortization	0	0	0	0
General and administrative expenses	0	0	0	0
Interest expense (income), net	0	0	0	0
Loss on extinguishment of debt			0
Other expense (income) , net	0	0	0	0
Income from continuing operations before provision for income taxes	0	0	0	0
Provision for (benefit from ) income taxes	0	0	0	0
Income from continuing operations before non-controlling interests	0	0	0	0
(Loss) income from discontinued operations, net of tax	0	0	0	0
Equity in income from subsidiaries, net of tax	(35,173)	(30,465)	(54,009)	(44,699)
Net income	(35,173)	(30,465)	(54,009)	(44,699)
Net income (loss) attributable to non-controlling interests	0	0	0	0
Net income attributable to MasTec, Inc.	(35,173)	(30,465)	(54,009)	(44,699)
Comprehensive income (loss)	(35,173)	(30,465)	(54,009)	(44,699)
Consolidation, Eliminations [Member] | Segment, Continuing Operations [Member]
Condensed Financial Statements, Captions [Line Items]
Depreciation and amortization	$ 0	$ 0	$ 0