Average Market Price of Common Stock and the Incremental Shares that were Dilutive or Potentially Dilutive (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Average market price of Real Industry common stock	$ 9.63	$ 10.64	$ 8.44	$ 10.54
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	2,700,732	2,830,904	2,616,287	2,821,079
Unvested Restricted Common Stock
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	271,401	113,204	204,142	103,379
Common Stock Options
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	851,364	1,217,700	872,946	1,217,700
Unvested Performance Shares
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	85,714		43,094
Warrants
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	1,492,253	1,500,000	1,496,105	1,500,000