CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals)	1 Months Ended	12 Months Ended
	Jan. 24, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement Of Stockholders' Equity [Abstract]
Stock split conversion ratio	three-for-two	three-for-two	three-for-two	three-for-two