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Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Significant Non-Cash Investing and Financing Activities (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Document Period End Date | Mar. 31, 2019 |  |  |
Cash and cash equivalents | $ 322,477,000 | $ 558,248,000 | $ 438,961,000 | $ 573,383,000
Restricted Cash and Cash Equivalents | 302,410,000 | 268,129,000 | 338,635,000 | 250,705,000
Cash paid during the period for: |  |  |  |
Interest | 20,127,000 | 14,472,000 |  |
Income taxes | 3,120,000 | 3,179,000 |  |
Significant non-cash investing and financing activities |  |  |  |
Other payable issued for purchased customer accounts | 608,000 | 1,690,000 |  |
Estimated acquisition earn-out payables and related charges | 18,155,000 | 4,524,000 |  |
Cash and Cash Equivalents inclusive of Restricted Cash [Member] |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cash and Cash Equivalents, Period Increase (Decrease) | (152,709,000) | 2,289,000 |  |
Cash and cash equivalents | $ 624,887,000 | $ 826,377,000 | $ 777,596,000 | $ 824,088,000

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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