Accounts receivable and unbilled, related parties, current.

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Contract with customer, liability, current with related parties.

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Lease expiration month and year.

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Lease expiration year.

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Lease occupancy year.

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Number of buildings.

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Number of lease agreements.

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Number of lease renewal options.

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For an unclassified balance sheet, amounts due from an Entity employee, not to include stockholders or officers.

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of lessee's right to use underlying asset under operating lease.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Expenses incurred for travel and entertainment during the period.

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Related Party Transactions - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) RenewalOption Agreement Building	Mar. 31, 2020 USD ($)	Dec. 31, 2018 RenewalOption Agreement	Dec. 31, 2020 USD ($)
Related Party Transaction [Line Items]
Advanced billings	$ 6,100			$ 6,500
Accounts receivable and unbilled, net	2,200			2,600
Operating lease cost recognized	5,730	$ 3,768
Operating lease right-of-use assets	112,266			113,809
Current portion of lease liability	16,111			15,890
Long-term portion of lease liabilities	114,144			115,143
Employee Loans \| Prepaid Expenses and Other Current Assets and Other Assets
Related Party Transaction [Line Items]
Employee advances receivables	200			200
Service Agreements \| LIB
Related Party Transaction [Line Items]
Advanced billings	600			700
Accounts receivable and unbilled, net	100			300
Service Agreements \| LIB \| Revenue Net
Related Party Transaction [Line Items]
Revenue with related parties	500	1,000
Service Agreements \| CinRx Pharma and Subsidiaries
Related Party Transaction [Line Items]
Advanced billings	5,500			5,800
Accounts receivable and unbilled, net	2,000			2,200
Service Agreements \| CinRx Pharma and Subsidiaries \| Revenue Net
Related Party Transaction [Line Items]
Revenue with related parties	4,800	4,400
Service Agreements \| The Summit
Related Party Transaction [Line Items]
Expenses incurred	$ 100	200
Leased Real Estate \| Chief Executive Officer
Related Party Transaction [Line Items]
Term of lease	12 years
Lease expiration period	2022-11
Number of lease renewal, 10-year option \| RenewalOption	1
Lease term upon renewal	10 years
Leased Real Estate \| Chief Executive Officer \| Office Space
Related Party Transaction [Line Items]
Number of lease renewal, 10-year option \| RenewalOption			2
Lease term upon renewal			10 years
Current portion of lease liability				700
Long-term portion of lease liabilities				66,800
Lease expiration year			2040
Number of lease agreements \| Agreement			1
Leased Real Estate \| Chief Executive Officer \| Direct Costs and Selling, General And Administrative
Related Party Transaction [Line Items]
Operating lease cost recognized	$ 500	500
Leased Real Estate \| Chief Executive Officer \| Direct Costs and Selling, General And Administrative \| Office Space
Related Party Transaction [Line Items]
Operating lease cost recognized	$ 1,400
Leased Real Estate \| Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Number of lease renewal, 10-year option \| RenewalOption	1
Lease term upon renewal	10 years
Lease expiration year	2027
Number of lease agreements \| Agreement	2
Number of buildings \| Building	2
Lease occupancy year	2012
Leased Real Estate \| Chief Executive Officer And Immediate Family \| Direct Costs and Selling, General And Administrative
Related Party Transaction [Line Items]
Operating lease cost recognized	$ 900	900
Leased Real Estate \| Operating Lease Right-of-Use Assets \| Chief Executive Officer
Related Party Transaction [Line Items]
Operating lease right-of-use assets	3,000			3,500
Leased Real Estate \| Operating Lease Right-of-Use Assets \| Chief Executive Officer \| Office Space
Related Party Transaction [Line Items]
Operating lease right-of-use assets	56,200			56,600
Leased Real Estate \| Operating Lease Right-of-Use Assets \| Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Operating lease right-of-use assets	19,100			19,700
Leased Real Estate \| Other Current Liabilities \| Chief Executive Officer
Related Party Transaction [Line Items]
Current portion of lease liability	1,900			1,900
Leased Real Estate \| Other Current Liabilities \| Chief Executive Officer \| Office Space
Related Party Transaction [Line Items]
Current portion of lease liability	800
Leased Real Estate \| Other Current Liabilities \| Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Current portion of lease liability	2,500			2,400
Leased Real Estate \| Operating Lease Liabilities \| Chief Executive Officer
Related Party Transaction [Line Items]
Long-term portion of lease liabilities	1,100			1,600
Leased Real Estate \| Operating Lease Liabilities \| Chief Executive Officer \| Office Space
Related Party Transaction [Line Items]
Long-term portion of lease liabilities	66,600
Leased Real Estate \| Operating Lease Liabilities \| Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Long-term portion of lease liabilities	16,600			$ 17,200
Travel Services \| Chief Executive Officer
Related Party Transaction [Line Items]
Travel expenses with related party	$ 100	$ 200