CONDENSED CONSOLIDATED BALANCE SHEET - Unaudited (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
CURRENT ASSETS, VIEs
Cash and cash equivalents	$ 2,125,515	$ 2,198,781
Marketable securities, current	67,164	23,345
Accounts receivable, net	838,425	935,676
Contract assets	1,012,109	859,675
Other current assets	389,519	378,043
NONCURRENT ASSETS, VIEs
Property, plant and equipment, net	425,633	463,827
Other assets	253,313	269,610
Liabilities, Current [Abstract]
Accounts payable	1,117,493	1,115,625
Contract liabilities	1,071,812	1,093,761
Accrued salaries, wages and benefits	513,710	578,827
Other accrued liabilities	380,332	376,451
Other noncurrent liabilities	$ 555,281	$ 593,765
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares issued (in dollars per share)	600,000	0
Preferred stock share outstanding (in shares)	600,000	0
Common stock shares authorized (in shares)	375,000,000	375,000,000
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock shares issued (in shares)	141,411,916	140,715,205
Common stock shares outstanding (in shares)	141,411,916	140,715,205
Variable Interest Entity, Primary Beneficiary
CURRENT ASSETS, VIEs
Cash and cash equivalents	$ 700,554	$ 654,852
Marketable securities, current	30,066	66
Accounts receivable, net	208,700	238,376
Contract assets	320,616	237,923
Other current assets	22,300	29,408
NONCURRENT ASSETS, VIEs
Property, plant and equipment, net	37,917	34,847
Other assets	38,565	40,829
Liabilities, Current [Abstract]
Accounts payable	292,524	328,940
Contract liabilities	334,168	262,811
Accrued salaries, wages and benefits	26,168	28,381
Other accrued liabilities	16,148	36,646
Other noncurrent liabilities	$ 7,104	$ 9,164