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Summary Of Significant Accounting Policies (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Loan impairment threshold period |  | 90 days |  |
Threshold of reporting unit goodwill carrying value for further analysis |  | $ 0 |  |
Goodwill impairment charges |  | 0 |  |
Allowance for doubtful accounts |  | 19,600,000 | $ 18,700,000 |
Incremental payments due upon termination of contract |  | 0 |  |
Operating lease right-of-use assets, net |  | 750,734,000 | 793,181,000 |
Lease liabilities |  | $ 799,099,000 | $ 839,800,000 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  | Accounts payable and accrued expenses | Accounts payable and accrued expenses |
Office Equipment [Member] | Minimum [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Fixed assets, Useful life |  | 2 years |  |
Office Equipment [Member] | Maximum [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Fixed assets, Useful life |  | 7 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Fixed assets, Useful life |  | 3 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Fixed assets, Useful life |  | 39 years |  |
ASU 2016-13 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Increase in allowance for credit losses | $ 10,400,000 | $ 10,400,000 |  |
ASU 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative adjustments for accounting changes |  | $ 7,800,000 |  |
ASU 2017-08 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative adjustments for accounting changes |  |  |  | $ 4,400,000
ASU 2016-02 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Operating lease right-of-use assets, net |  |  |  | $ 670,000,000
Operating Lease Right-of-Use Assets Statement of Financial Position [Extensible Enumeration] |  |  |  | Property Plant And Equipment Net
Lease liabilities |  |  |  | $ 670,000,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  |  |  | Accounts payable and accrued expenses
ASU 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative adjustments for accounting changes |  |  |  | $ 6,700,000

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