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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Effects of ASC 606 Adoption on the Consolidated Income Statement and Balance Sheet (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Statement of Income Items |  |  |  |
Revenues | $ 794,977 | $ 919,762 |  |
Cost of service | 252,386 | 455,936 |  |
Selling, general and administrative expenses | 386,421 | 358,856 |  |
Provision for income taxes | (24,673) | $ (12,321) |  |
Assets: |  |  |  |
Accounts receivable, net of allowances for doubtful accounts | 288,101 |  |  | $ 301,887
Prepaid expenses and other current assets | 213,841 |  |  | 206,545
Deferred income taxes | 11,420 |  |  | 13,146
Other noncurrent assets | 323,019 |  |  | 207,297
Liabilities: |  |  |  |
Accounts payable and accrued liabilities | 1,039,379 |  |  | 1,039,607
Deferred income taxes | 452,470 |  |  | 436,879
Other noncurrent liabilities | 225,267 |  |  | 220,961
Shareholders' Equity: |  |  |  |
Retained earnings | 1,738,545 |  |  | 1,597,897
Accumulated other comprehensive loss | (176,961) |  |  | $ (183,144)
Without Effects of New Accounting Standard |  |  |  |
Statement of Income Items |  |  |  |
Revenues | 1,045,570 |  |  |
Cost of service | 489,305 |  |  |
Selling, general and administrative expenses | 410,242 |  |  |
Provision for income taxes | (22,384) |  |  |
Assets: |  |  |  |
Accounts receivable, net of allowances for doubtful accounts | 286,665 |  |  |
Prepaid expenses and other current assets | 214,326 |  |  |
Deferred income taxes | 12,523 |  |  |
Other noncurrent assets | 249,772 |  |  |
Liabilities: |  |  |  |
Accounts payable and accrued liabilities | 1,039,223 |  |  |
Deferred income taxes | 436,735 |  |  |
Other noncurrent liabilities | 224,802 |  |  |
Shareholders' Equity: |  |  |  |
Retained earnings | 1,679,811 |  |  |
Accumulated other comprehensive loss | (174,966) |  |  |
Accounting Standards Update 2014-09 | Effects of New Accounting Standard |  |  |  |
Statement of Income Items |  |  |  |
Revenues | 250,593 |  |  |
Cost of service | 236,919 |  |  |
Selling, general and administrative expenses | 23,821 |  |  |
Provision for income taxes | 2,289 |  |  |
Assets: |  |  |  |
Accounts receivable, net of allowances for doubtful accounts | (1,436) |  |  |
Prepaid expenses and other current assets | 485 |  |  |
Deferred income taxes | 1,103 |  |  |
Other noncurrent assets | (73,247) |  | $ 64,600 |
Liabilities: |  |  |  |
Accounts payable and accrued liabilities | (156) |  |  |
Deferred income taxes | (15,735) |  | 15,600 |
Other noncurrent liabilities | (465) |  |  |
Shareholders' Equity: |  |  |  |
Retained earnings | (58,734) |  | $ 51,000 |
Accumulated other comprehensive loss | $ 1,995 |  |  |

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