Average Market Price of Common Stock and the Incremental Shares that were Dilutive or Potentially Dilutive (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Average market price of Real Industry common stock	$ 10.63	$ 8.77	$ 9.18	$ 9.93
Effect of dilutive securities
Total potentially dilutive common stock equivalents		2,815,062	2,683,297	2,819,052
Unvested Restricted Common Stock
Effect of dilutive securities
Total potentially dilutive common stock equivalents		109,319	224,526	105,381
Common Stock Options
Effect of dilutive securities
Total potentially dilutive common stock equivalents		1,205,743	850,707	1,213,671
Unvested Performance Shares
Effect of dilutive securities
Total potentially dilutive common stock equivalents			116,190
Warrants
Effect of dilutive securities
Total potentially dilutive common stock equivalents		1,500,000	1,491,874	1,500,000