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DESCRIPTION OF BUSINESS AND RELATED MATTERS (Details) |  |  |  |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 08, 2018 USD ($) shares | May 24, 2018 USD ($) | May 23, 2018 USD ($) | Jan. 08, 2018 USD ($) | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) segment shares | Dec. 31, 2017 shares
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Number of reportable business segments | segment |  |  |  |  |  |  | 2 |
Dividends |  | $ 2.035 |  | $ 1,499,935,000 |  |  | $ 1,499,935,000 |
Stock repurchase program authorized amount |  |  |  |  |  |  | $ 2,000,000,000 |
Payments to Acquire Businesses, Gross |  |  |  |  | $ 10,125,000 |  |  |
Dividends, Paid-in-kind | $ 0.672 |  |  |  |  |  |  |
Dividends Payable, Date of Record |  |  | $ 0.4163 |  |  |  |  |
Common Class A |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest | shares | 489,384,523 |  |  |  |  |  | 492,812,285 | 246,982,292
Common Class B [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest | shares |  |  |  |  |  |  | 247,684,443 | 490,086,674
Fees for Executive Services | Affiliates |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Related party transaction, annual fee |  |  |  |  |  |  | $ 30,000,000 |
ATS Acquisition |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Entities under common control, percentage of voting interst acquired |  |  |  |  |  | 70.00% |  |
Entities under common control, consideration transferred |  |  |  |  |  | $ 1.00 |  |
Total Stockholders' Equity |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  | 1,499,935,000 |
Paid-in Capital |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  | 963,711,000 |
Retained Earnings |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  | $ (536,224,000) |

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