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Tax Effects of Temporary Differences That Gives Rise to Significant Portions of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Deferred tax liabilities: |  |  |
Property, plant and equipment | $ 6,501 | $ 6,631 | $ 7,331
Goodwill | 14,013 | 11,467 | 9,443
Other intangible assets | 970 | 2,707 | 3,525
Accruals | 51 | 77 | 1,185
Other | 4 | 88 | 97
Unrealised FX | 1,056 | 1,160 |
Total deferred tax liabilities recognized | 22,595 | 22,130 | 21,581
Deferred tax assets: |  |  |
Net operating loss carry forwards | 27,646 | 25,116 | 21,981
Property, plant and equipment | 2,739 | 2,345 | 1,324
Accrued expenses and payments on account | 29,429 | 19,382 | 11,652
Stock compensation | 6,291 | 5,586 | 4,818
Deferred compensation expense | 1,187 | 1,136 | 1,197
Other |  |  | 214
Unrealised FX | 92 | 98 |
Total deferred tax assets | 67,384 | 53,663 | 41,186
Valuation allowance for deferred tax assets | (21,591) | (18,817) | (16,445)
Deferred tax assets recognized | 45,793 | 34,846 | 24,741
Net deferred tax asset | $ 23,198 | $ 12,716 | $ 3,160

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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