Other Current Assets, Accrued Expenses and Other Current Liabilities and Other Long-Term Liabilities - Summary of Selected Balance Sheet Items (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Other current assets:
Deferred project costs	$ 2,450	$ 3,872
Prepaid income tax	2,994	2,592
Other prepaid expenses	4,702	3,522
Deferred tax asset, short-term	1,276	1,276
Other current assets	1,524	1,676
Total other current assets	12,946	12,938
Accrued expenses and other current liabilities:
Accrued acquisition payments	1,956	2,178
Accrued volume discounts	817	1,314
Other accrued expenses	4,778	5,111
Deferred tax liability, short-term	904	904
Other current liabilities	1,193	1,648
Total accrued expenses and other current liabilities	9,648	11,155
Other long-term liabilities:
Pension and post retirement obligations, long-term portion	2,628	2,452
Accrued acquisition payments, long-term portion	724	2,286
Accrued income tax uncertainties	5,164	5,115
Accrued restructuring, long-term portion	1,548	1,606
Other	1,540	1,713
Total other long-term liabilities	$ 11,604	$ 13,172