Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue $ 14,780,094 $ 9,940,120 $ 4,975,496
Cost of revenue 13,654,449 9,206,744 4,666,008
Gross profit 1,125,645 733,376 309,488
Expenses:      
Selling, general and administrative 440,759 369,492 145,788
Depreciation of property and equipment 37,926 16,749 6,744
Amortization of intangible assets 203,192 130,116 16,385
Total operating expenses 681,877 516,357 168,917
Operating income 443,768 217,019 140,571
Interest and other expense, net 41,626 26,682 2,277
Income before income taxes 402,142 190,337 138,294
Income tax expense (benefit):      
Current 147,739 107,241 52,402
Deferred (44,336) (37,925) (5,894)
Total income tax expense (benefit) 103,403 69,316 46,508
Net income 298,739 121,021 91,786
Less net income attributable to non-controlling interest 36,569 4,363 0
Net income attributable to the Company $ 262,170 $ 116,658 $ 91,786
Earnings per share attributable to the Company:      
Basic (in dollars per share) $ 1.27 $ 0.70 $ 0.74
Diluted (in dollars per share) $ 1.27 $ 0.70 $ 0.73