Accounting Standards and Significant Accounting Policies - Additional Information (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle
Recurring revenue percentage of total revenue (percent)	75.00%
Cash and investments	$ 472,500,000
Revolving line of credit	0	$ 0
Accounts receivable, net	426,900,000	396,500,000
Allowance for losses	9,300,000
Unbilled Revenues
New Accounting Pronouncements or Change in Accounting Principle
Accounts receivable, net	137,500,000	134,000,000.0
Unbilled Revenues \| Retention Receivable
New Accounting Pronouncements or Change in Accounting Principle
Accounts receivable, net	13,200,000	$ 13,100,000
Case Management, Business Process Management, Data and Insight
New Accounting Pronouncements or Change in Accounting Principle
Goodwill assessed for impairment	$ 152,000,000.0
Percentage of total goodwill (percent)	18.00%
Data and Insight
New Accounting Pronouncements or Change in Accounting Principle
Goodwill assessed for impairment	$ 75,700,000
Revolving Credit Facility \| Credit Agreement
New Accounting Pronouncements or Change in Accounting Principle
Revolving line of credit	0
Line of credit facility, unused borrowing capacity	$ 400,000,000.0

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Percentage of Total Goodwill

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Recurring Revenue Percentage of Total Revenue

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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-SubTopic 10
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Amount of allowance for credit loss on accounts receivable.

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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