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Employee Incentive, Deferred Compensation, And Retirement Plans (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 05, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized to grant |  | 6,000,000 |  |
Stock-based compensation |  | $ 186,303 | $ 165,641 | $ 94,006
Tax benefit (provision) related to stock-based compensation recognized in shareholders' equity |  | (4,904) | 14,741 | 19,858
Issuance of common stock for acquisitions |  | $ 12,813 | 79,747 | 19,243
Options granted during the period |  | 0 |  |
Total intrinsic value of options exercised |  |  |  | 1,600
Cash proceeds from the exercise of stock options |  |  |  | 300
Tax benefits realized from the exercise of stock options |  | $ 100 | 600 | 500
Investments, at fair value |  | 133,563 | 181,017 |
Deferred compensation liability |  | 8,600 | 12,400 |
Contributions to the Profit Sharing Plan |  | $ 6,500 | 7,700 | 4,900
Mutual Funds [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of earnings deferred into mutual funds |  | 2.00% |  |
Investments, at fair value |  | $ 11,300 | 15,500 |
Incentive Stock Award Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation |  | 190,100 | 142,100 | 111,600
Tax benefit (provision) related to stock-based compensation recognized in shareholders' equity |  | (4,900) | $ 14,700 | $ 19,900
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock units, charges at the date of modification |  | $ 58,600 |  |
Issuance of common stock for acquisitions | $ 23,800 |  |  |
Total number of stock units outstanding |  | 21,800,000 |  |
Unvested stock units outstanding |  | 16,276,000 | 12,274,000 |
Unrecognized compensation expense related to non-vested options |  | $ 379,100 |  |
Weighted-average period, compensation cost expected to recognized, in years |  | 3 years 2 months 12 days |  |
Fair value of stock units vested |  | $ 134,100 |  |
Performance-based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period in years |  | 5 years |  |
Award performance period |  | 4 years |  |
Total number of stock units outstanding |  | 500,000 |  |
Unvested stock units outstanding |  | 500,000 |  |
SWAP Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Elective deferrals vested percentage |  | 100.00% |  |
Percentage of earnings deferred into company stock units |  | 4.00% |  |
Percentage of earnings deferred into company stock units, Company match |  | 25.00% |  |
Percentage of earnings deferred into company stock units, Additional elective deferral |  | 1.00% |  |
Minimum [Member] | Deferred Compensation Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period in years |  | 1 year |  |
Minimum [Member] | Incentive Stock Award Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period in years |  | 1 year |  |
Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period in years |  | 1 year |  |
Minimum [Member] | Performance-based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Potential shares vesting percentage |  | 0.00% |  |
Minimum [Member] | SWAP Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period in years |  | 1 year |  |
Maximum [Member] | Deferred Compensation Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period in years |  | 8 years |  |
Maximum [Member] | Incentive Stock Award Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period in years |  | 8 years |  |
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period in years |  | 8 years |  |
Maximum [Member] | Performance-based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Potential shares vesting percentage |  | 200.00% |  |
Maximum [Member] | SWAP Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period in years |  | 8 years |  |

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