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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 ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted Cash and Cash Equivalents | $ 250,705,000 | $ 265,637,000 | $ 229,753,000
Cash and Cash Equivalents, at Carrying Value | 573,383,000 | 515,646,000 | 443,420,000
Cash paid during the period for: |  |  |
Interest | 36,172,000 | 37,652,000 | 37,542,000
Income taxes | 152,024,000 | 143,111,000 | 132,874,000
Significant non-cash investing and financing activities |  |  |
Other payables issued for purchased customer accounts | 11,708,000 | 10,664,000 | 10,029,000
Estimated acquisition earn-out payables and related charges | 6,921,000 | 4,463,000 | 36,899,000
Notes Assumed | 0 | 492,000 | 0
Notes received on the sale of fixed assets and customer accounts | 0 | 22,000 | 7,755,000
Cash and Cash Equivalents inclusive of Restricted Cash [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 824,088,000 | $ 781,283,000 | $ 673,173,000

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