Income Tax Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Computed expected tax provision	$ 24,822	$ 26,668	$ 96,490
State and local taxes, net of federal income tax impact	1,482	4,157	6,035
Adjustment for state deferred tax rate	2,916
State investment tax credits		(1,649)	958
Federal credits	(412)	(25,153)	(9,922)
Federal manufacturing deduction	(2,443)	(2,993)	(2,373)
Uncertain tax positions	2,610	(3,796)
Patient Protection and Affordable Care Act		3,290
Non-deductible acquisition costs	(1,215)	1,263
Change in valuation allowances	2,796
U.S. tax provision on foreign operations	365
Other	325	609	2,033
Income tax provision	$ 31,246	$ 2,396	$ 93,221
Effective tax rate	44.10%	3.10%	33.80%

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Income Tax Reconciliation, Adjustment for State Deferred Tax Rate

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Income Tax Reconciliation, Nondeductible Expense, Acquisition Costs

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Income Tax Reconciliation, Patient Protection and Affordable Care Act

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Income Tax Reconciliation Uncertain Tax Positions

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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 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 sum of other amounts reflected in the reconciliation of the statutory tax provision (benefit) to the actual tax provision (benefit).

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The sum of the differences 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 tax credits.

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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 investment tax credits generated or utilized under enacted tax laws during the period.

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