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Business Acquisitions - Summary of Company's Preliminary Allocation of Purchase Price (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Business Acquisition [Line Items] |  |
Goodwill | $ 3,845,157 | $ 3,366,150
Third-Party Receivables Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Current assets | 17,819 |
Property and equipment | 5,807 |
Other noncurrent assets | 115 |
Goodwill | 190,977 |
Other intangible assets | 221,870 |
Current liabilities | (5,863) |
Deferred income tax liabilities - long-term | (31,114) |
Other long-term liabilities | (829) |
Total assets and liabilities | 398,782 |
Other Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Current assets | 200 |
Property and equipment | 866 |
Other noncurrent assets | 689 |
Goodwill | 299,005 |
Other intangible assets | 82,756 |
Current liabilities | (333) |
Deferred income tax liabilities - long-term | (22,388) |
Total assets and liabilities | 360,795 |
Third-Party Receivable And Other Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Current assets | 18,019 |
Property and equipment | 6,673 |
Other noncurrent assets | 804 |
Goodwill | 489,982 |
Other intangible assets | 304,626 |
Current liabilities | (6,196) |
Deferred income tax liabilities - long-term | (53,502) |
Other long-term liabilities | (829) |
Total assets and liabilities | $ 759,577 |

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