XML 70 R56.htm IDEA: XBRL DOCUMENT v3.3.1.900
Cash, Cash Equivalents and Investments - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]      
Cash balance included foreign bank balance $ 39,279,000 $ 43,732,000  
Gross realized gains on sale of debt securities 549,000 843,000 $ 508,000
Gross realized losses on sale of debt securities 205,000 170,000 $ 194,000
Maximum amount committed to invest in limited partnership 20,500,000    
Contribution to limited partnership 19,886,000    
Remaining amount of commitment in limited partnership 614,000    
Proceeds from Limited Partnership Investments 1,014,000    
Carrying value of investment 942,000 $ 1,956,000  
Cost Method Investments, Fair Value Disclosure $ 5,600,000