Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Accounts receivable reserves	$ 982	$ 804
Accrued liabilities	2,753	3,123
Deferred compensation obligation	895	1,426
Other	74	75
Deferred tax assets, current	4,704	5,428
Liabilities:
Prepaid expenses	(186)	(448)
Deferred tax asset, net – current	4,518	4,980
Assets:
Accrued liabilities	613	649
Deferred compensation obligation	6,956	6,324
Stock-based compensation	1,817	1,185
Pension and post-retirement benefit plans	5,303	5,125
Goodwill and intangible assets	7,543	10,407
Deferred revenue	27	28
Other	293	995
Deferred tax assets, non-current	22,552	24,713
Liabilities:
Fixed assets	(1,198)	(1,651)
Other	(331)	(122)
Deferred tax liabilities, non-current	(1,529)	(1,773)
Valuation allowance	(85)	(85)
Deferred tax asset, net – non-current	20,938	22,855
Net deferred tax asset	$ 25,456	$ 27,835