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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Estimate and Goodwill (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended | 15 Months Ended | 18 Months Ended |
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Oct. 31, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2015 | Dec. 31, 2015 | Jul. 31, 2014
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value |  | $ 203,154 |  |  |  | $ 180,271 |  |  |  | $ 203,154 | $ 180,271 |  |  | $ 203,154 |
Net income |  | 5,123 | $ 6,394 | $ 5,099 | $ 4,043 | 3,811 | $ 4,074 | $ 3,024 | $ 3,276 | 20,659 | 14,185 | $ 17,961 |  |  |
Amount of goodwill recorded |  | 25,111 |  |  |  | $ 25,111 |  |  |  | 25,111 | 25,111 |  |  | 25,111 |
Monarch Black Hawk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of goodwill recorded |  | $ 25,100 |  |  |  |  |  |  |  | 25,100 |  |  |  | $ 25,100 |
Monarch Black Hawk Parking Structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value |  |  |  |  |  |  |  |  |  |  |  | $ 4,800 |  |  |
Estimated depreciable life |  |  |  |  |  |  |  |  |  |  |  | P37Y |  |  |
Monarch Black Hawk Parking Structure | Service Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  | $ 2,900
Estimated depreciable life |  |  |  |  |  |  |  |  |  |  |  |  | P15M | P18M |
Depreciation expense per month | $ 40 |  |  |  |  |  |  |  |  |  | 300 |  |  |  |
Depreciation expense net of tax per month |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  | 1,400 | 2,900 |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | $ (900) | $ (1,900) |  |  |  |
Basic and diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.05) | $ (0.11) |  |  |  |

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