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Summary of Tax Provision Allocation to Financial Statement Items (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income from continuing operations $ 10,104,000 $ 10,664,000 $ 11,908,000
Income/(loss) from discontinued operations 387,000 (5,302,000) (1,690,000)
Stockholders' equity, unrealized gain (loss) on investment securities & foreign currency (357,000) (182,000) 143,000
Additional paid in capital, share-based compensation tax benefit (247,000) (275,000) (383,000)
Total Income Tax Expense $ 9,887,000 $ 4,905,000 $ 9,978,000