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Share-Based and Other Deferred Compensation (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 23 Months Ended
Nov. 30, 2017
USD ($)
shares
Jul. 31, 2017
vote
shares
Nov. 30, 2016
USD ($)
tranche
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
shares
Sep. 30, 2018
USD ($)
payment_installment
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2014
shares
Feb. 15, 2020
shares
Mar. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Deferred Compensation Arrangement Compensation Expense       $ 13,147 $ 8,599   $ 41,328 $ 18,419            
Severance Costs       538 953   7,022 4,421            
Cash Payments Related to Separation Benefits       763 $ 54   6,636 $ 2,399            
Special Charges [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Severance Costs       $ 781     $ 2,024              
LP Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Limited Partnership Units Convertible Conversion Ratio     1       1              
2016 Stock Incentive Plan [Member] | Class A [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of Additional Shares Authorized (in shares) | shares                     10,000,000      
Number of Shares Available for Grant (in shares) | shares       5,367,000 7,412,000   5,367,000 7,412,000            
Long Term Incentive Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Deferred Compensation Arrangement Compensation Expense       $ 7,007 $ 6,721   $ 21,082 $ 19,279            
Long Term Incentive Plan Performance Period (in years)             4 years              
Deferred Compensation Arrangement with Individual, Recorded Liability       63,225     $ 63,225              
Number of Payment Installments | payment_installment             3              
Deferred Compensation Arrangement with Individual, Distribution Paid               19,401            
Long Term Incentive Plan [Member] | Second Installment [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Deferred Compensation Arrangement with Individual, Distribution Paid             $ 4,532              
Class G LP Interests [Member] | Minimum [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Management Basis EBIT Margin (as a percent)             12.00%              
Class G LP Interests [Member] | Maximum [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Management Basis EBIT Margin (as a percent)             16.00%              
Class H LP Interests [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Class H Interests Performance Period (in years)             3 years              
Class H LP Interests [Member] | Minimum [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Management Basis EBIT Margin (as a percent)             7.00%              
Management Basis EBIT             $ 8,000              
Class H LP Interests [Member] | Maximum [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Management Basis EBIT Margin (as a percent)             17.00%              
Management Basis EBIT             $ 48,000              
Class I-P Units [Member] | Board of Directors Chairman [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Compensation Expense       1,164 1,164   3,455 3,455            
Grant of I-P Units (in units) | shares     400,000                      
Retirement Notice Requirement     1 year                      
Number of Tranches of Class I-P Units | tranche     2                      
Number of Class I-P Units in Each Tranche (in units) | shares     200,000                      
Number of Consecutive Trading Days Required for Class I-P Units to Exceed Thresholds     20 days                      
Grant of I-P Units, Fair Value of Award     $ 24,412                      
Class K-P Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Compensation Expense       302     897              
Limited Partnership Units Convertible Conversion Ratio 1                          
Grant of K-P Units (in units) | shares 64,000                          
K-P Units to be Granted Upon Achievement of Benchmarks (in units) | shares 16,000                          
Grant of K-P Units, Fair Value of Award $ 5,000                          
Restricted Stock Units (RSUs) [Member] | 2006 and 2016 Stock Incentive Plans [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Compensation Expense       41,679 38,124   $ 130,785 116,363            
Shares Vested During Period (in shares) | shares             2,472,000              
Shares Forfeited During Period (in shares) | shares             51,000              
Restricted Stock Units (RSUs) [Member] | 2016 Stock Incentive Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares Issued During Period (in shares) | shares             1,932,000              
Restricted Stock Units (RSUs) [Member] | 2016 Stock Incentive Plan [Member] | Minimum [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares             $ 86.23              
Restricted Stock Units (RSUs) [Member] | 2016 Stock Incentive Plan [Member] | Maximum [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares             $ 114.80              
Deferred Cash Compensation Program [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Deferred Compensation, Vesting Period (in years)             4 years              
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount                   $ 3,750 $ 41,147     $ 82,592
Restricted Cash Award [Member] | Board of Directors Chairman [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Retirement Notice Requirement     6 months                      
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount     $ 35,000                      
Deferred Compensation Arrangement With Individual Cash Award Tranche One Vesting Amount     11,000                      
Deferred Compensation Arrangement With Individual Cash Award Tranche Two Vesting Amount     $ 6,000                      
Awards Vesting Period     4 years                      
Restricted Cash Award [Member] | Minimum [Member] | Board of Directors Chairman [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount     $ 8,750                      
Restricted Cash Award [Member] | Maximum [Member] | Board of Directors Chairman [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount     $ 35,000                      
Other Deferred Cash [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount                   $ 29,500        
Awards Vesting Period                   5 years        
Employee Loans [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Deferred Compensation Arrangement Compensation Expense       5,701 5,021   $ 13,810 14,050            
Deferred Compensation Arrangement with Individual, Recorded Liability       39,408     $ 39,408              
Requisite Service Period (in years)             1 year              
Maximum Contractual Term (in years)             5 years              
Evercore ISI [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Management Basis EBIT Margin (as a percent)                   11.70%        
Management Basis EBIT                   $ 26,904        
Evercore ISI [Member] | Scenario, Forecast [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Management Basis EBIT Margin (as a percent)                 14.00%          
Management Basis EBIT                 $ 34,357          
Evercore ISI [Member] | Class E LP Units [Member] | Acquisition Related [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Units Amended In Period (in units) | shares           19,000                
Evercore ISI [Member] | Class E LP Units [Member] | Acquisition Related [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Compensation Expense         4,835     15,273            
Evercore ISI [Member] | Class G LP Interests [Member] | Acquisition Related [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Units Amended In Period (in units) | shares           14,000                
Evercore ISI [Member] | Class H LP Interests [Member] | Acquisition Related [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of Units Outstanding (in units) | shares   4,148,000                        
Units Amended In Period (in units) | shares           162,000                
Evercore ISI [Member] | Class H LP Interests [Member] | Acquisition Related [Member] | Scenario, Forecast [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Interests That Would Vest Related To Acquisition Related Awards Based On Current Performance (in units) | shares                         2,005,000  
Evercore ISI [Member] | Class J LP Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Common Stock, Number of Votes | vote   1                        
Evercore ISI [Member] | Class J LP Units [Member] | Class B [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock Issued During Period, Shares, New Issues | shares   1                        
Evercore ISI [Member] | Class J LP Units [Member] | Acquisition Related [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Compensation Expense       $ 3,741 2,315   $ 11,313 2,315            
Evercore ISI [Member] | Class G And H Interests [Member] | Acquisition Related [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Compensation Expense         $ 2,003 $ (26,224)   (12,897)            
Evercore ISI [Member] | Vested LP Units [Member] | Class E LP Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Grant of LP Units (in units) | shares                       710,000    
Evercore ISI [Member] | Vested LP Units [Member] | Class G LP Interests [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Grant of LP Units (in units) | shares                       538,000    
Evercore ISI [Member] | Vested LP Units [Member] | Class H LP Interests [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Grant of LP Units (in units) | shares                       2,044,000    
Evercore ISI [Member] | Vested LP Units [Member] | Class J LP Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Grant of LP Units (in units) | shares   1,012,000                        
Evercore ISI [Member] | Vested LP Units [Member] | Class J LP Units [Member] | Subject to Continued Employment [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Grant of LP Units (in units) | shares   963,000                        
Evercore ISI [Member] | Unvested LP Units [Member] | Class E LP Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Grant of LP Units (in units) | shares                       710,000    
Evercore ISI [Member] | Unvested LP Units [Member] | Class G LP Interests [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Grant of LP Units (in units) | shares                       540,000    
Evercore ISI [Member] | Unvested LP Units [Member] | Class H LP Interests [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Grant of LP Units (in units) | shares                       2,051,000    
Evercore ISI [Member] | Unvested LP Units [Member] | Class J LP Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Grant of LP Units (in units) | shares   938,000                        
Evercore ISI [Member] | Modified LP Units and Interests [Member] | Acquisition Related [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Compensation Expense               3,532            
Amended Grant Date Weighted Average Fair Value, Granted               $ 14,891