| In millions, except per share items | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenues: | | | | | | | | |
| Revenues | 466.8 | 443.1 | 403.0 | 396.9 | 424.3 | 453.8 | 470.2 | 479.0 |
| Revenues growth | 5.3% | 9.9% | 1.5% | -6.5% | -6.5% | -3.5% | -1.8% | 2.6% |
| Operating Expenses: | | | | | | | | |
| Payroll and related | 180.9 | 168.3 | 145.6 | 149.0 | 175.9 | 177.0 | 174.9 | 181.6 |
| Club operating | 219.1 | 197.7 | 180.5 | 185.1 | 196.7 | 192.7 | 179.7 | 179.0 |
| General and administrative | 27.8 | 25.0 | 22.7 | 24.7 | 30.7 | 31.4 | 28.4 | 24.1 |
| Depreciation and amortization | 38.2 | 37.4 | 40.8 | 43.7 | 47.9 | 47.3 | 49.1 | 49.4 |
| Impairment of fixed assets | 7.2 | 2.1 | 6.5 | 0.7 | 14.6 | 4.6 | 0.7 | 3.4 |
| Total operating expenses | 473.2 | 430.6 | 396.1 | 403.3 | 837.4 | 453.1 | 862.4 | 437.5 |
| Operating (loss) income | -6.5 | 12.5 | 6.9 | -6.4 | 7.1 | 0.8 | 40.6 | 41.4 |
| Operating margin | -1.4% | 2.8% | 1.7% | -1.6% | 1.7% | 0.2% | 8.6% | 8.7% |
| Interest expense | -13.0 | -13.5 | -12.7 | -13.9 | -20.6 | -19.0 | -22.6 | -24.6 |
| Interest income | -0.1 | -0.1 | -0.1 | 0.0 | | | 0.0 | 0.0 |
| Equity in the earnings of investees | -0.3 | -0.3 | | | | | | |
| Loss before (benefit) provision for corporate income taxes | -19.1 | -0.5 | -5.3 | 17.8 | 6.8 | -16.4 | 19.7 | |
| (Benefit) provision for corporate income taxes | 0.2 | -0.4 | -9.7 | 9.8 | -14.4 | 52.6 | 7.4 | 6.3 |
| Net loss including non-controlling interests | -19.3 | -0.1 | 4.4 | | | | | |
| Less: net loss attributable to non-controlling interests | -0.7 | -0.2 | | | | | | |
| Net loss attributable to Town Sports International Holdings, Inc. and subsidiaries | -18.6 | 0.1 | 4.4 | 8.0 | 21.2 | -69.0 | 12.3 | 12.0 |
| |
| Loss per share: | | | | | | | | |
| Basic (in dollars per share) | ($0.70) | | $0.17 | $0.31 | $0.86 | ($2.84) | $0.51 | $0.51 |
| Diluted (in dollars per share) | ($0.70) | | $0.17 | $0.31 | $0.84 | ($2.84) | $0.50 | $0.50 |
| |
| Weighted average number of shares used in calculating loss per share: | | | | | | | | |
| Basic (in shares) | 26.6 | 25.9 | 25.2 | 25.6 | 24.6 | 24.3 | 24.0 | 23.4 |
| Diluted (in shares) | 26.6 | 26.3 | 25.9 | 26.1 | 25.1 | 24.3 | 24.7 | 24.1 |