Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities - Changes In Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail)

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Accrued Liabilities - Changes In Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accrued Liabilities [Line Items]      
Initial warranty accrual, beginning balance $ 2,218 $ 2,725 $ 2,235
Provision for estimated warranty cost 1,705 1,586 3,126
Warranty expenditures (2,224) (2,093) (2,636)
Initial warranty accrual, ending balance 1,699 2,218 2,725
Total warranty accrual, long term     424
Total warranty accrual, current portion $ 1,699 $ 2,218 $ 2,301