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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, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 546,721,000 | $ 401,846,000 | $ 515,646,000 | $ 443,420,000
Restricted Cash and Cash Equivalents | 279,368,000 | 231,075,000 | 265,637,000 | 229,753,000
Cash paid during the period for: |  |  |  |
Interest | 14,531,000 | 14,323,000 |  |
Income taxes | 2,704,000 | 6,922,000 |  |
Significant non-cash investing and financing activities |  |  |  |
Other payable issued for purchased customer accounts | 0 | 300,000 |  |
Change in estimated acquisition earn-out payables and related charges | (211,000) | 606,000 |  |
Business Acquisition Cost of Entity Note Payable | 0 | 492,000 |  |
Cash and Cash Equivalents inclusive of Restricted Cash [Member] |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 826,089,000 | $ 632,921,000 | $ 781,283,000 | $ 673,173,000

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