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Impact of Change in Accounting Policies - Statement of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:      
Gross revenue $ 2,595,777 $ 2,402,321 $ 2,364,956
Reimbursable expenses   (643,882) (698,469)
Total revenue 2,595,777 1,758,439 1,666,487
Costs and expenses:      
Selling, general and administrative 325,794 323,741 325,726
Depreciation and amortization 65,916 61,297 59,575
Restructuring charges 12,490 7,753 8,159
Total costs and expenses 2,222,420 1,420,101 1,354,793
Income from operations 373,357 338,338 311,694
Interest income 4,759 2,346 1,484
Interest expense (13,502) (12,627) (13,006)
Income before income taxes expense 364,614 328,057 300,172
Income tax expense (Note 13) (41,958) (46,569) (37,993)
Net income 322,656 $ 281,488 $ 262,179
Adjustments      
Costs and expenses:      
Net income 3,709    
Adjustments | Accounting Standards Update 2014-09      
Revenue:      
Gross revenue 4,657    
Reimbursable expenses (702,812)    
Total revenue (698,155)    
Costs and expenses:      
Direct costs (702,812)    
Selling, general and administrative 472    
Depreciation and amortization 0    
Restructuring charges 0    
Total costs and expenses (702,340)    
Income from operations 4,185    
Interest income 0    
Interest expense 0    
Income before income taxes expense 4,185    
Income tax expense (Note 13) (476)    
Net income 3,709    
Balance without adoption of Topic 606      
Revenue:      
Gross revenue 2,600,434    
Reimbursable expenses (702,812)    
Total revenue 1,897,622    
Costs and expenses:      
Direct costs 1,115,408    
Selling, general and administrative 326,266    
Depreciation and amortization 65,916    
Restructuring charges 12,490    
Total costs and expenses 1,520,080    
Income from operations 377,542    
Interest income 4,759    
Interest expense (13,502)    
Income before income taxes expense 368,799    
Income tax expense (Note 13) (42,434)    
Net income $ 326,365