Significant Components of Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Deferred tax assets:
Deferred revenue	$ 336	$ 1,217
Allowance for doubtful accounts	775	765
Accrued enhancement expense	1,101	1,349
Insurance reserves	1,159	1,281
Deferred lease credits	319	441
Share-based compensation	986	929
Vendor rebates	662	1,192
Investments		72
Property and equipment	1,549	778
Net operating and capital loss carryforward	17,563	13,749
Other	2,596	2,245
Valuation allowance	(26,377)	(23,405)	(12,200)
Total deferred tax assets	669	613
Deferred tax liabilities:
Deferred lease incentives	566	486
Prepaid service	103	124
Other		3
Total deferred tax liabilities	669	613
Net deferred tax assets