Commitments and Contingencies (Detail) - Future minimum lease payments (USD $)	Dec. 31, 2012
2013	$ 1,601,000
2014	1,611,000
2015	1,757,000
2016	1,351,000
2017	959,000
Thereafter	3,675,000
Total minimum lease payments	10,954,000
Less amount representing interest	30,000
Present value of total minimum lease payments	10,924,000
Capital Lease [Member]
2013	147,000
2014	147,000
2015	147,000
2016	147,000
2017	147,000
Thereafter	12,000
Total minimum lease payments	747,000
Less amount representing interest	30,000
Present value of total minimum lease payments	717,000
Operating Lease [Member]
2013	1,454,000
2014	1,464,000
2015	1,610,000
2016	1,204,000
2017	812,000
Thereafter	3,663,000
Total minimum lease payments	10,207,000
Present value of total minimum lease payments	$ 10,207,000