Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Disclosure - Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) [Line Items]
Accounts payable	$ 2,592	$ 2,797
Accrued liabilities:
Employee benefits	5,656	6,541
Customer tooling	540	282
Taxes other than on income	544	439
Insurance	248	305
Other	664	697
Total	$ 10,244	$ 11,061