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Property and Equipment (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 26,345 [1] $ 23,372 [1]
Accumulated depreciation and amortization 20,340 [1] 17,185 [1]
Fully Depreciated Fixed Assets
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 15,800 13,300
Accumulated depreciation and amortization $ 15,800 $ 13,300
[1] Includes the original cost and accumulated depreciation of fully-depreciated fixed assets which were $13.3 million and $15.8 million at December 31, 2011 and 2012, respectively.