Income taxes - Schedule of Effective Income Tax Rate Reconciliation for Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax rate			35.00%	35.00%	35.00%
State taxes, net			2.40%	(92.40%)	3.70%
Foreign rate differential			(4.40%)	(77.20%)	0.50%
Valuation allowance-foreign losses			8.80%	(237.80%)	6.40%
SRL Intangible			(3.20%)	117.90%	(4.70%)
Domestic manufacturing deduction			(2.40%)	82.90%	(2.80%)
Withholding Taxes			2.40%	(81.60%)	3.10%
Settlement of U.S. Government resolutions			(1.80%)	(463.70%)
Other items, net			(1.00%)	26.90%	2.50%
Income tax expense/effective rate			35.80%	(690.00%)	43.70%
Statutory U.S. federal income tax rate			$ 24,565	$ (719)	$ 19,261
State taxes, net			1,708	1,896	2,051
Foreign rate differential			(3,115)	1,585	251
Valuation allowance-foreign losses			6,183	4,882	3,497
SRL Intangible			(2,214)	(2,421)	(2,607)
Domestic manufacturing deduction			(1,694)	(1,703)	(1,529)
Withholding Taxes			1,679	1,676	1,687
Settlement of U.S. Government resolutions	10,500	46,000	(1,260)	9,520
Other items, net			(714)	(551)	1,420
Income tax expense			$ 25,138	$ 14,165	$ 24,031

Effective Income Tax Rate Reconciliation Withholding Taxes

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Income Tax Reconciliation Withholding Taxes

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the deduction for qualified production activities received under enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the different amortization methods allowed under generally accepted accounting principles and enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to domestic income tax settlements during the period.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the deduction for qualified production activities received under enacted tax laws.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to total foreign income tax expense or benefit. The foreign income tax expense or benefit difference represents the income tax expense or benefit at applicable domestic statutory income tax rates applied to foreign earnings or loss for the period versus the foreign income tax expense or benefit calculated by applying the appropriate foreign tax rates.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the different amortization methods allowed under generally accepted accounting principles and enacted tax laws.

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