SHAREHOLDERS' EQUITY - Spin off (Details) $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($)
SHAREHOLDERS' EQUITY
Separation of TopBuild Corp.	$ 828
Retained Earnings (Deficit)
SHAREHOLDERS' EQUITY
Separation of TopBuild Corp.	828
TopBuild \| Retained Earnings (Deficit)
SHAREHOLDERS' EQUITY
Separation of TopBuild Corp.	$ 828

The change in equity as a result of a spin-off transaction (a regular or reverse spin-off) which is based on the recorded amounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Spinoff
-URI http://asc.fasb.org/extlink&oid=6749415

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 60
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6406278&loc=d3e26268-112671

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reverse Spinoff
-URI http://asc.fasb.org/extlink&oid=6524171

Name:	us-gaap_StockholdersEquityNoteSpinoffTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration