Segment Information - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2013 Agencies	Dec. 31, 2013 Agencies	Dec. 31, 2012 Agencies	Dec. 31, 2011 Agencies
Segment Reporting [Abstract]
Number of care centers available for sale	28	3
Number of care centers sold		20
Number of care centers closed		10	3	29