Annual report pursuant to Section 13 and 15(d)

Changes in Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail)

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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Accrued Liabilities [Line Items]      
Initial warranty accrual, beginning balance $ 1,699 $ 2,218 $ 2,725
Provision for estimated warranty cost 475 1,705 1,586
Warranty expenditures (1,078) (2,224) (2,093)
Initial warranty accrual, ending balance 1,096 1,699 2,218
Total warranty accrual, long term         
Total warranty accrual, current portion $ 1,096 $ 1,699 $ 2,218