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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, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Document Period End Date | Mar. 31, 2018 |  |  |
Cash and cash equivalents | $ 558,248,000 | $ 546,721,000 | $ 573,383,000 | $ 515,646,000
Restricted Cash and Cash Equivalents | 268,129,000 | 279,368,000 | 250,705,000 | 265,637,000
Cash paid during the period for: |  |  |  |
Interest | 14,472,000 | 14,531,000 |  |
Income taxes | 3,179,000 | 2,704,000 |  |
Significant non-cash investing and financing activities |  |  |  |
Other payable issued for purchased customer accounts | 1,690,000 | 0 |  |
Estimated acquisition earn-out payables and related charges | 4,524,000 | (211,000) |  |
Cash and Cash Equivalents inclusive of Restricted Cash [Member] |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cash and cash equivalents | $ 826,377,000 | $ 826,089,000 | $ 824,088,000 | $ 781,283,000

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