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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 ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Document Period End Date | Sep. 30, 2017 |  |  |
Cash and cash equivalents | $ 546,520,000 | $ 488,683,000 | $ 515,646,000 | $ 443,420,000
Restricted Cash and Cash Equivalents | 276,687,000 | 278,279,000 | 265,637,000 | 229,753,000
Cash paid during the period for: |  |  |  |
Interest | 32,504,000 | 33,122,000 |  |
Income taxes | 110,853,000 | 104,739,000 |  |
Significant non-cash investing and financing activities |  |  |  |
Other payable issued for purchased customer accounts | 11,395,000 | 10,505,000 |  |
Estimated acquisition earn-out payables and related charges | 1,332,000 | 3,828,000 |  |
Business Acquisition Cost of Entity Note Payable | 0 | 492,000 |  |
Cash and Cash Equivalents inclusive of Restricted Cash [Member] |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cash and cash equivalents | $ 823,207,000 | $ 766,962,000 | $ 781,283,000 | $ 673,173,000

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