Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Accounts payable	$ 3,064	$ 3,850
Accrued liabilities:
Employee benefits	6,417	7,388
Taxes other than on income	541	266
Customer tooling	402	407
Insurance	250	217
Professional	98	231
Other	527	437
Total accounts payable and accrued liabilities	$ 11,299	$ 12,796