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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