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Employee Incentive, Deferred Compensation, And Retirement Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized to grant |  |  | 5,900,000 |  |
Stock-based compensation |  |  | $ 55,266 | $ 94,349 |
Provision for income tax expense (benefit) | $ 30,387 | $ 6,022 | 43,894 | 22,880 |
Investments, at fair value | 128,332 |  | 128,332 |  | $ 133,563
Deferred compensation liability | 5,300 |  | 5,300 |  | 8,600
Contributions to the Profit Sharing Plan | $ 3,300 | 1,600 | $ 3,700 | 2,900 |
Mutual Funds [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of earnings deferred into mutual funds | 2.00% |  | 2.00% |  |
Investments, at fair value | $ 12,400 |  | $ 12,400 |  | $ 11,300
Incentive Stock Award Plans [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation | 34,400 | 65,900 | 65,600 | 94,800 |
Tax impact related to stock-based compensation provision |  | $ 1,000 |  | $ 5,200 |
Incentive Stock Award Plans [Member] | ASU No. 2016-09 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Provision for income tax expense (benefit) | $ (200) |  | $ (17,100) |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total number of stock units outstanding | 19,600,000 |  | 19,600,000 |  |
Unvested stock units outstanding | 16,200,000 |  | 16,200,000 |  |
Unrecognized compensation expense related to non-vested options | $ 361,200 |  | $ 361,200 |  |
Weighted-average period, compensation cost expected to recognized, in years |  |  | 3 years |  |
Performance-based Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards vesting period in years |  |  | 5 years |  |
Total number of stock units outstanding | 600,000 |  | 600,000 |  |
Unvested stock units outstanding | 600,000 |  | 600,000 |  |
Award performance period |  |  | 4 years |  |
SWAP Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Elective deferrals vested percentage | 100.00% |  | 100.00% |  |
Percentage of earnings deferred into company stock units | 4.00% |  | 4.00% |  |
Percentage of earnings deferred into company stock units, Company match | 25.00% |  | 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 percentage of converted shares |  |  | 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 |  |  | 10 years |  |
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards vesting period in years |  |  | 10 years |  |
Maximum [Member] | Performance-based Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Potential percentage of converted shares |  |  | 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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