Average Market Price of Common Stock and the Incremental Shares that were Dilutive or Potentially Dilutive (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Average market price of Real Industry common stock	$ 4.94	$ 6.86
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	3,474,571	3,117,092
Unvested Restricted Common Stock
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	759,003	491,286
Outstanding Common Stock Options
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	747,400	775,650
Unvested Restricted Stock Units
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	519,835	381,823
Warrants
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	1,448,333	1,468,333