Condensed Unaudited Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 13,295	$ 26,382
Accounts receivable, net of allowance	1,115,991	877,164
Inventories	67,015	83,939
Current deferred tax assets, net	8,851	3,276
Prepaid expenses and deposits	28,127	30,550
Other current assets	17,200	8,628
Current assets of discontinued operations	21,763	18,591
Total current assets	1,272,242	1,048,530
Property and equipment, net	470,544	350,378
Goodwill	860,207	826,110
Other intangible assets, net	168,701	137,100
Available for sale auction rate securities	9,341	14,408
Other assets	32,355	32,105
Long-term assets of discontinued operations	7,516	7,648
Total assets	2,820,906	2,416,279
Current liabilities:
Current maturities of long-term debt	49,907	52,596
Accounts payable	383,372	401,078
Accrued salaries and wages	63,683	31,529
Accrued taxes payable	9,968	12,511
Accrued insurance	22,028	21,754
Other accrued expenses	39,942	11,550
Acquisition-related contingent consideration, current	51,305	19,216
Billings in excess of costs and earnings	133,464	123,435
Other current liabilities	35,034	29,698
Current liabilities of discontinued operations	9,905	10,679
Total current liabilities	798,608	714,046
Acquisition-related contingent consideration, net of current portion	115,580	135,712
Long-term debt	806,497	546,323
Long-term deferred tax liabilities, net	141,302	119,388
Other liabilities	38,606	38,875
Total liabilities	1,900,593	1,554,344
Commitments and Contingencies (See Note 17)
Shareholders' equity:
Preferred stock, $1.00 par value; authorized shares - 5,000,000; issued and outstanding shares - none	0	0
Common stock, $0.10 par value; authorized shares - 145,000,000; issued shares - 86,194,290 and 85,915,552 as of June 30, 2013 and December 31, 2012, respectively	8,619	8,592
Capital surplus	809,336	803,166
Retained earnings	254,226	200,915
Accumulated other comprehensive loss	(12,742)	(5,501)
Treasury stock, at cost; 9,467,286 shares as of both June 30, 2013 and December 31, 2012	(150,000)	(150,000)
Total MasTec, Inc. shareholders' equity	915,441	857,172
Non-controlling interests	4,872	4,763
Total shareholders' equity	920,313	861,935
Total liabilities and shareholders' equity	2,820,906	2,416,279
Contributed Shares [Member] | Common Stock Outstanding [Member]
Shareholders' equity:
Contributed shares	$ 6,002	$ 0