Income Tax Expense Differed from Amounts Computed by Applying Statutory U.S. Federal Income Tax Rate to Income before Income Taxes, Noncontrolling Interest and Equity in Income of Equity Investments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Provision of Income Taxes [Line Items]
Computed "expected" income tax expense	$ 124,199	$ 110,793	$ 107,734
International tax rate differential	2,781	1,831	(4,376)
State income tax expense (benefit), net of federal income tax effect	2,143	3,164	2,326
Increase in valuation allowance	193	3,773	2,564
Tax credits	(3,762)	(9,044)	(2,824)
Deduction for domestic production activities	(5,727)	(5,524)
Permanent differences and other, net	(4,725)	(2,396)	664
Total income tax expense	$ 115,102	$ 102,597	$ 106,088

Income Tax Expense Differed from Amounts Computed by Applying Statutory U.S. Federal Income Tax Rate to Income before Income Taxes, Noncontrolling Interest and Equity in Income of Equity Investments (Detail) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Reconciliation of Provision of Income Taxes [Line Items]

Computed "expected" income tax expense

$ 124,199

$ 110,793

$ 107,734

International tax rate differential

2,781

1,831

(4,376)

State income tax expense (benefit), net of federal income tax effect

2,143

3,164

2,326

Increase in valuation allowance

193

3,773

2,564

Tax credits

(3,762)

(9,044)

(2,824)

Deduction for domestic production activities

(5,727)

(5,524)

Permanent differences and other, net

(4,725)

(2,396)

664

Total income tax expense

$ 115,102

$ 102,597

$ 106,088

- Definition

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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- Definition

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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- Definition

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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- Definition

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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