Description of Business and Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2013 Facility	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Patient receivable	Dec. 31, 2012 Patient receivable	Mar. 31, 2013 Full Service Centers Facility	Mar. 31, 2013 Pre- and Post- Operative Centers Facility	Mar. 31, 2013 Minimum	Mar. 31, 2013 Maximum
Summary Of Business And Significant Accounting Policies [Line Items]
Number of vision correction centers operated	53					49	4
Number of vision correction centers licensed to supplier who use trade mark	2
Period over which patient receivables are recovered								12 months	36 months
Receivable balances that remain open past maturity amount	$ 50,000		$ 42,000
Doubtful accounts on our patient receivables	87,000	243,000		1,500,000	1,700,000
Receivables wrote-off against the allowance for doubtful	227,000	217,000
Receivables recovered which were previously written off	$ 29,000	$ 31,000