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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 1,902,700 | $ 1,204,900 |  |
Investments | 1,477,300 | 1,257,500 |  |
Other assets | 231,900 | 346,200 |  |
Total assets | 7,534,700 | 6,225,000 |  |
Liabilities | 717,500 | 529,200 |  |
Attributable to redeemable non-controlling interests | 992,800 | 687,200 | $ 0 | $ 0
Consolidated T. Rowe Price investment products [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 103,100 | 65,600 |  |
Net assets | 1,992,500 | 1,614,900 |  |
Attributable to redeemable non-controlling interests | 992,800 | 687,200 |  |
Attributable to T. Rowe Price Group | 999,700 | 927,700 |  |
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 103,100 | 65,600 | 0 |
Investments | 1,914,500 | 1,559,900 |  |
Other assets | 30,800 | 55,000 |  |
Total assets | 2,048,400 | 1,680,500 |  |
Liabilities | 55,900 | 65,600 |  |
Net assets | 1,992,500 | 1,614,900 |  |
Voting interest entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 192,400 | 225,600 |  |
Attributable to redeemable non-controlling interests | 60,800 | 69,500 |  |
Attributable to T. Rowe Price Group | 131,600 | 156,100 |  |
Voting interest entities [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 7,100 | 10,300 | 0 |
Investments | 188,800 | 219,300 |  |
Other assets | 12,900 | 4,800 |  |
Total assets | 208,800 | 234,400 |  |
Liabilities | 16,400 | 8,800 |  |
Net assets | 192,400 | 225,600 |  |
Variable interest entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Net assets | 1,800,100 | 1,389,300 |  |
Attributable to redeemable non-controlling interests | 932,000 | 617,700 |  |
Attributable to T. Rowe Price Group | 868,100 | 771,600 |  |
Variable interest entities [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 96,000 | 55,300 | $ 0 |
Investments | 1,725,700 | 1,340,600 |  |
Other assets | 17,900 | 50,200 |  |
Total assets | 1,839,600 | 1,446,100 |  |
Liabilities | 39,500 | 56,800 |  |
Net assets | 1,800,100 | 1,389,300 |  |
T.Rowe Price U.S. mutual funds [Member] | Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 6,200 | 8,800 |  |
Investments | $ 15,000 | $ 4,200 |  |

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