Description of Business and Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Facility	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Patient receivable	Dec. 31, 2012 Patient receivable	Jun. 30, 2013 Full Service Centers Facility	Jun. 30, 2013 Pre- and Post- Operative Centers Facility	Jun. 30, 2013 Minimum	Jun. 30, 2013 Maximum
Summary Of Business And Significant Accounting Policies [Line Items]
Number of vision correction centers operated			56					50	6
Number of vision correction centers licensed to supplier who use trade mark			3
Period over which patient receivables are recovered										12 months	36 months
Receivable balances that remain open past maturity amount	$ 38,000		$ 38,000		$ 42,000
Doubtful accounts on our patient receivables			276,000	518,000		1,500,000	1,700,000
Receivables wrote-off against the allowance for doubtful	238,000	199,000	464,000	415,000
Receivables recovered which were previously written off	$ 26,000	$ 32,000	$ 55,000	$ 62,000