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Schedule II -Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reserve for Uncollectible Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 1,240 $ 1,235 $ 1,358
Charged to Costs and Expenses 63 173 322
Charged to Other Accounts         
Deductions (184) (154) (411)
Other 12 (14) (34)
Balance at End of Period 1,131 1,240 1,235
Deferred Tax Valuation Allowance [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 3,400 373 373
Charged to Costs and Expenses 546 3,027  
Charged to Other Accounts         
Deductions (2,457)    
Balance at End of Period 1,489 3,400 373
Reserve for Inventory Obsolescence [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 4,359 5,052 5,776
Charged to Costs and Expenses 949 1,078 1,509
Charged to Other Accounts         
Deductions (1,924) (1,688) (1,897)
Other 30 (83) (336)
Balance at End of Period $ 3,414 $ 4,359 $ 5,052