Income Taxes - Summary of Deferred Income Taxes Assets And Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Noncurrent deferred tax assets:
Amortization and fixed assets	$ 5,270	$ 6,558
Accounts receivable	706	410
Inventories	3,959	3,074
Pension obligations	5,268	7,228
Warranty obligations	3,608	2,267
Accrued benefits	1,370	1,980
Foreign exchange contracts	94	212
Restricted stock	153	173
Tax credits carryforward	2,562	2,062
Net operating loss carryforward:	15,094	20,928
Other temporary differences not currently available for tax purposes	287	(573)
Total noncurrent assets	38,371	44,319
Valuation allowance	(13,118)	(11,029)
Net noncurrent deferred tax assets	25,253	33,290
Noncurrent deferred tax liabilities:
Amortization and fixed assets	(1,158)	(938)
Net operating loss carryforwards	2,121	1,432
Other temporary differences not currently available for tax purposes	(796)	(667)
Total noncurrent tax liabilities	167	(173)
Valuation allowance	(1,286)	(741)
Net noncurrent deferred tax liabilities	(1,119)	(914)
Total deferred tax asset	$ 24,134	$ 32,376