Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012 Facility	Dec. 31, 2011	Dec. 31, 2010
Summary Of Business And Significant Accounting Policies [Line Items]
Number of vision correction centers operated	54
Number of vision correction centers licensed to supplier who use trade mark	2
Original maturity period	90 days
Provision for loss on doubtful accounts	$ 914,000	$ 746,000	$ 1,061,000
Percentage of bad debt on revenue	0.90%	0.70%	1.10%
Receivables wrote-off against the allowance for doubtful	1,000,000	851,000.0
Receivables recovered which were previously written off	127,000	137,000
Amount of finance and interest on patients	820,000	621,000	740,000
Asset impairment cost held for use	617,000	104,000
Enhancement accrual charge	2,800,000	3,400,000
Enhancement accrual charge	1,800,000	2,100,000
Insurance reserves	6,600,000	7,200,000
Insurance reserves included in accrued and other liabilities	871,000	951,000
Total claims and legal expenses disbursed	7,700,000
Vesting period of stock-based compensation awards	3 years
Restricted stock unit, performance based awards
Summary Of Business And Significant Accounting Policies [Line Items]
Vesting period of stock-based compensation awards	3 years
Other Accounts Receivable
Summary Of Business And Significant Accounting Policies [Line Items]
Provision for loss on doubtful accounts	$ 340,000	$ 298,000
Minimum
Summary Of Business And Significant Accounting Policies [Line Items]
Percentage of investment in owned affiliate	20.00%
Period over which patient receivables are recovered	12 months
Maximum
Summary Of Business And Significant Accounting Policies [Line Items]
Percentage of investment in owned affiliate	50.00%
Period over which patient receivables are recovered	36 months
Maximum | Leasehold Improvements
Summary Of Business And Significant Accounting Policies [Line Items]
Useful life of leasehold improvement	5 years