Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Revenue $ 4,914,479 $ 3,219,716
Cost of revenue 4,599,817 2,971,344
Gross profit 314,662 248,372
Expenses:    
Selling, general and administrative 130,519 100,495
Depreciation of property and equipment 12,368 6,970
Amortization of intangible assets 54,986 50,056
Total operating expenses 197,873 157,521
Operating income 116,789 90,851
Interest and other expense, net 11,336 11,039
Income before income taxes 105,453 79,812
Income tax expense (benefit):    
Current 40,442 39,680
Deferred (12,334) (16,652)
Total income tax expense (benefit) 28,108 23,028
Net income 77,345 56,784
Less: Net income attributable to non-controlling interest 13,900 5,376
Net income attributable to the Company $ 63,445 $ 51,408
Earnings per share attributable to the Company:    
Basic (in dollars per share) $ 0.31 $ 0.25
Diluted (in dollars per share) $ 0.31 $ 0.25
Weighted average number of shares used in computing earnings per share:    
Basic (in shares) 206,525,188 205,576,875
Diluted (in shares) 207,086,677 206,423,549