Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Accounts receivable reserves	$ 804	$ 779
Accrued liabilities	3,123	2,902
Deferred compensation obligation	1,426	1,111
Pension and post-retirement benefit plans	0	19
Other	75	75
Deferred tax assets, current	5,428	4,886
Liabilities:
Prepaid expenses	(448)	(224)
Deferred tax asset, net – current	4,980	4,662
Assets:
Accrued liabilities	649	579
Deferred compensation obligation	6,324	6,896
Stock-based compensation	1,185	773
Pension and post-retirement benefit plans	5,125	4,916
Goodwill and intangible assets	10,407	11,750
Deferred revenue	28	106
Other	995	1,531
Deferred tax assets, non-current	24,713	26,551
Liabilities:
Fixed assets	(1,651)	(2,693)
Other	(122)	(503)
Deferred tax liabilities, non-current	(1,773)	(3,196)
Valuation allowance	(85)	(85)
Deferred tax asset, net – non-current	22,855	23,270
Net deferred tax asset	$ 27,835	$ 27,932