Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net income	$ 122,456	$ 3,279	$ 193,582
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	255,601	240,171	61,969
Stock-based compensation expense	66,172	78,943	46,661
Deferred taxes	1,524	(217,414)	(2,648)
Gain on extinguishment of debt	0	0	(2,500)
Gain from divested operations	(45,447)	0	0
Amortization and write-off of deferred financing fees	13,815	15,062	3,082
Changes in assets and liabilities, net of acquisitions and divestitures:
Fees receivable, net	(115,003)	(368,516)	(68,661)
Deferred commissions	(31,247)	(61,393)	(18,673)
Prepaid expenses and other current assets	(50,551)	13,251	(21,604)
Other assets	11,456	(18,529)	20,005
Deferred revenues	187,147	382,852	97,979
Accounts payable, accrued, and other liabilities	55,235	186,811	56,440
Cash provided by operating activities	471,158	254,517	365,632
Investing activities:
Additions to property, equipment and leasehold improvements	(126,873)	(110,765)	(49,863)
Acquisitions - cash paid (net of cash acquired)	(15,855)	(2,641,780)	(48,196)
Divestitures - cash received (net of cash transferred)	526,779	0	0
Cash provided by (used in) in investing activities	384,051	(2,752,545)	(98,059)
Financing activities:
Proceeds from employee stock purchase plan	14,689	11,711	9,250
Proceeds from borrowings	0	3,025,000	715,000
Payments for deferred financing fees	0	(51,171)	(4,975)
Payments on borrowings	(1,010,972)	(404,438)	(835,000)
Purchases of treasury stock	(260,832)	(41,272)	(58,961)
Cash (used in) provided by financing activities	(1,257,115)	2,539,830	(174,686)
Net (decrease) increase in cash and cash equivalents and restricted cash	(401,906)	41,802	92,887
Effects of exchange rates on cash and cash equivalents and restricted cash	(6,489)	25,902	(5,640)
Cash and cash equivalents and restricted cash, beginning of period	567,058	499,354	412,107
Cash and cash equivalents and restricted cash, end of period	158,663	567,058	499,354
Cash paid during the period for:
Interest	117,500	98,500	23,400
Income taxes, net of refunds received	$ 95,800	$ 76,100	$ 86,300

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration