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Note 23 - Impact of Recently Issued Accounting Standards - Restatement Adjustment (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Revenues | $ 2,825,427 | $ 2,435,200
Cost of revenues | 1,817,526 | 1,585,865
Selling, general and administrative expenses | 705,798 | 614,040
Income tax | 53,260 | 61,907
Non-controlling interest share of earnings |  | 20,319
Non-controlling interest redemption increment | 7,709 | 22,393
Net earnings attributable to Company | $ 97,658 | $ 51,362
Diluted net earnings per common share (in dollars per share) | $ 2.45 | $ 1.31
Accounts receivable, net of allowance | $ 455,232 | $ 382,542
Contract assets, current | 99,468 | 104,737
Unbilled revenues |  |
Contract assets, non-current | 10,964 | 7,104
Deferred income tax asset, net | 34,195 | 48,401
Accounts payable and accrued expenses | 240,513 | 227,087
Accrued compensation | 469,563 | 419,635
Contract liabilities | 39,635 | 35,423
Unearned revenues |  |
Deferred income tax liability, net | 27,550 | 19,044
Deficit | (21,751) | (115,489)
Accumulated other comprehensive loss | (61,218) | (43,157)
Non-controlling interests | $ 4,420 | 4,457
Previously Reported [Member] |  |
Revenues |  | 2,275,362
Cost of revenues |  | 1,427,281
Selling, general and administrative expenses |  | 613,335
Income tax |  | 63,300
Non-controlling interest share of earnings |  | 20,236
Non-controlling interest redemption increment |  | 22,583
Net earnings attributable to Company |  | $ 49,313
Diluted net earnings per common share (in dollars per share) |  | $ 1.25
Accounts receivable, net of allowance |  | $ 383,385
Contract assets, current |  |
Unbilled revenues |  | 41,370
Contract assets, non-current |  |
Deferred income tax asset, net |  | 52,394
Accounts payable and accrued expenses |  | 252,904
Accrued compensation |  | 365,709
Contract liabilities |  |
Unearned revenues |  | 11,919
Deferred income tax liability, net |  | 18,579
Deficit |  | (128,411)
Accumulated other comprehensive loss |  | (43,354)
Non-controlling interests |  | 4,019
Lease Brokerage Revenue Adjustment [Member] |  |
Revenues |  | 13,569
Cost of revenues |  | 12,315
Selling, general and administrative expenses |  | 705
Income tax |  | (1,393)
Non-controlling interest share of earnings |  | 83
Non-controlling interest redemption increment |  | (190)
Net earnings attributable to Company |  | $ 2,049
Diluted net earnings per common share (in dollars per share) |  | $ 0.05
Accounts receivable, net of allowance |  | $ (843)
Contract assets, current |  | 104,737
Unbilled revenues |  | (41,370)
Contract assets, non-current |  | 7,104
Deferred income tax asset, net |  | (3,993)
Accounts payable and accrued expenses |  | (25,817)
Accrued compensation |  | 53,926
Contract liabilities |  | 35,423
Unearned revenues |  | (11,919)
Deferred income tax liability, net |  | 465
Deficit |  | 12,922
Accumulated other comprehensive loss |  | 197
Non-controlling interests |  | 438
Principal Versus Agent Adjustment [Member] |  |
Revenues |  | 146,269
Cost of revenues |  | 146,269
Selling, general and administrative expenses |  |
Income tax |  |
Non-controlling interest share of earnings |  |
Non-controlling interest redemption increment |  |
Net earnings attributable to Company |  |
Diluted net earnings per common share (in dollars per share) |  |
Accounts receivable, net of allowance |  |
Contract assets, current |  |
Unbilled revenues |  |
Contract assets, non-current |  |
Deferred income tax asset, net |  |
Accounts payable and accrued expenses |  |
Accrued compensation |  |
Contract liabilities |  |
Unearned revenues |  |
Deferred income tax liability, net |  |
Deficit |  |
Accumulated other comprehensive loss |  |
Non-controlling interests |  |

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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