Average Market Price of Common Stock and the Incremental Shares that were Dilutive or Potentially Dilutive (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Average market price of Real Industry common stock	$ 9.22	$ 9.58	$ 8.57
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	2,583,043	2,647,674	2,865,144
Unvested Restricted Common Stock
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	234,109	106,001	331,660
Common Stock Options
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	710,555	1,041,673	1,033,484
Unvested Performance Shares
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	152,438
Warrants
Potentially dilutive common stock equivalents:
Total potentially dilutive common stock equivalents	1,485,941	1,500,000	1,500,000