RIVIERA BLACK HAWK ACQUISITION TRANSACTION (Detail) (USD $)	0 Months Ended	3 Months Ended								12 Months Ended
	Apr. 26, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 29, 2011
RIVIERA BLACK HAWK ACQUISITION TRANSACTION
Amount borrowed under acquisition												$ 77,760,000
Consideration
Cash consideration	75,885,000
Liabilities assumed by the Company	3,505,000
Working capital adjustment.	604,000
Total consideration	79,994,000
Intangible Assets:
Amount of goodwill recorded		25,111,000				25,111,000				25,111,000	25,111,000
Acquisition cost												2,156,000
Net revenue and operating income included in the entity's consolidated income statement
Net Revenues		45,859,000	48,597,000	47,803,000	45,508,000	44,504,000	48,989,000	49,651,000	45,605,000	187,767,000	188,749,000	163,302,000
Income from operations		4,754,000	6,666,000	5,468,000	5,331,000	4,163,000	8,939,000	10,168,000	7,185,000	22,219,000	30,455,000	15,983,000
Monarch Black Hawk
RIVIERA BLACK HAWK ACQUISITION TRANSACTION
Acquisition deposit												3,800,000
Purchase Price													76,000,000
Payment of purchase price, net of deposit	72,200,000
Net working capital available after payment of indebtedness	2,100,000
Amount of purchase price escrowed to secure Seller's indemnification obligations	2,280,000
Period for which purchase price is escrowed	1 year
Tangible Assets:
Current assets	6,241,000
Total tangible assets	35,908,000
Intangible Assets:
Amount of goodwill recorded	25,110,000	25,100,000								25,100,000
Total intangible assets	37,190,000
Deferred tax asset	6,896,000
Total assets	79,994,000
Acquisition cost										0	0	2,200,000
Net revenue and operating income included in the entity's consolidated income statement
Net Revenues												29,678,000
Income from operations												6,350,000
Pro forma (unaudited) consolidated results of operations
Net revenues												183,043,000
Income from operations												17,516,000
Net income												9,542,000
Basic earnings per share (in dollars per share)												$ 0.59
Diluted earnings per share (in dollars per share)												$ 0.59
Monarch Black Hawk | Customer list
Intangible Assets:
Total intangible assets	10,490,000
Monarch Black Hawk | Trade Name
Intangible Assets:
Total intangible assets	1,590,000
Monarch Black Hawk | Land
Tangible Assets:
Total tangible assets	8,700,000
Monarch Black Hawk | Land improvements
Tangible Assets:
Total tangible assets	30,000
Monarch Black Hawk | Building improvement
Tangible Assets:
Total tangible assets	15,200,000
Monarch Black Hawk | Furniture and equipment
Tangible Assets:
Total tangible assets	5,737,000
Monarch Black Hawk | Credit Facility
RIVIERA BLACK HAWK ACQUISITION TRANSACTION
Amount borrowed under acquisition	$ 72,300,000