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Note 2 - Revision of Previously Issued Financial Statements - Revisions on Consolidated Financial Statements (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Selling, general and administrative $ 50,949 $ 46,385  
Depreciation and amortization 48,778 39,536  
Total costs and expenses 201,100 148,858  
Income from operations 64,661 58,576  
Income before income taxes 50,555 51,257  
Income tax provision 9,902 19,144  
Net income 40,653 32,113  
Comprehensive income $ 40,654 $ 32,115  
Basic (in dollars per share) $ 7.13 $ 5.66  
Diluted (in dollars per share) $ 7.08 $ 5.60  
Accounts receivable, net $ 25,477   $ 29,930
Change in deferred income taxes 5,710 $ (203)  
Net cash provided by operating activities $ 94,692 78,260  
Error Correction Related to Labor Capitalization [Member]      
Selling, general and administrative   46,256  
Depreciation and amortization   39,536  
Total costs and expenses   148,729  
Income from operations   58,698  
Income before income taxes   51,379  
Income tax provision   19,190  
Net income   32,189  
Comprehensive income   $ 32,191  
Basic (in dollars per share)   $ 5.68  
Diluted (in dollars per share)   $ 5.62  
Accounts receivable, net   $ 6,557  
Change in deferred income taxes   (157)  
Net cash provided by operating activities   78,260  
Previously Reported [Member]      
Selling, general and administrative [1]   46,256  
Total costs and expenses [1]   148,729  
Income from operations [1]   58,698  
Income before income taxes [1]   51,379  
Income tax provision [1]   19,190  
Net income [1]   32,189  
Comprehensive income [1]   $ 32,191  
Basic (in dollars per share) [1]   $ 5.68  
Diluted (in dollars per share) [1]   $ 5.62  
Accounts receivable, net     51,141
Change in deferred income taxes   $ (157)  
Net cash provided by operating activities   78,260  
Previously Reported [Member] | Error Correction Related to Labor Capitalization [Member]      
Selling, general and administrative   45,733  
Depreciation and amortization   38,404  
Total costs and expenses   147,074  
Income from operations   60,353  
Income before income taxes   53,034  
Income tax provision   19,819  
Net income   33,215  
Comprehensive income   $ 33,217  
Basic (in dollars per share)   $ 5.86  
Diluted (in dollars per share)   $ 5.80  
Accounts receivable, net   $ 6,034  
Change in deferred income taxes   472  
Net cash provided by operating activities   78,260  
Restatement Adjustment [Member]      
Selling, general and administrative   129  
Total costs and expenses   129  
Income from operations   (122)  
Income before income taxes   (122)  
Income tax provision   (46)  
Net income   (76)  
Comprehensive income   $ (76)  
Basic (in dollars per share)   $ (0.02)  
Diluted (in dollars per share)   $ (0.02)  
Accounts receivable, net     $ (21,211)
Change in deferred income taxes   $ (46)  
Net cash provided by operating activities    
Restatement Adjustment [Member] | Error Correction Related to Labor Capitalization [Member]      
Selling, general and administrative   523  
Depreciation and amortization   1,132  
Total costs and expenses   1,655  
Income from operations   (1,655)  
Income before income taxes   (1,655)  
Income tax provision   (629)  
Net income   (1,026)  
Comprehensive income   $ (1,026)  
Basic (in dollars per share)   $ (0.18)  
Diluted (in dollars per share)   $ (0.18)  
Accounts receivable, net   $ 523  
Change in deferred income taxes   (629)  
Net cash provided by operating activities    
[1] Refer to note 2 for details regarding this revision.