Current and Noncurrent Accrued and Other Liabilities - Summary of Current and Noncurrent Accrued and Other Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current And Noncurrent Accrued And Other Liabilities [Line Items]
Customer deposits	$ 8,189	$ 4,505
Deferred revenue on extended warranty contracts	7,007	6,461
Accrued payroll and benefits	6,612	7,267
Accrued warranty costs	6,172	5,370	3,996	3,138
Accrued death benefits	4,185	4,017
Accrued income taxes	3,043	709
Accrued contractual manufacturing obligations	2,764	2,075
Accrued group health and workers' compensation insurance claims	2,175	2,535
Fair value of derivatives and other	1,965	2,283
Accrued executive benefits	1,365	1,262
Accrued commissions	1,351	1,016
Accrued property taxes	1,011	804
Accrued contractual profit-sharing obligation	497	1,478
Other	4,731	4,134
Total current and noncurrent accrued liabilities	51,067	43,916
Less noncurrent portion	16,369	15,239
Current portion of accrued and other liabilities	$ 34,698	$ 28,677