Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Beginning Balance	$ 1,913,703	$ 1,595,764
Goodwill acquired during year	177,076	353,600
Goodwill allocation adjustments	(29,920)	(11,114)
Sale of assets	(1,178)	(2,887)
Changes due to currency fluctuation	5,422	(21,660)
Ending Balance	2,065,103	1,913,703
United States
Goodwill [Line Items]
Beginning Balance	1,506,416	1,279,758
Goodwill acquired during year	114,931	232,850
Goodwill allocation adjustments	(5,061)	(6,192)
Sale of assets	0	0
Changes due to currency fluctuation	0	0
Ending Balance	1,616,286	1,506,416
International
Goodwill [Line Items]
Beginning Balance	407,287	316,006
Goodwill acquired during year	62,145	120,750
Goodwill allocation adjustments	(24,859)	(4,922)
Sale of assets	(1,178)	(2,887)
Changes due to currency fluctuation	5,422	(21,660)
Ending Balance	$ 448,817	$ 407,287

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 43

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

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+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details

- Definition

The increase (decrease) in the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

+ References

+ Details

- Definition

Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

+ References+ Details