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Fair Value Of Financial Instruments (Narrative) (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 24 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Senior Notes [Member] Unsecured Debt [Member] Total Senior And Senior Convertible Notes [Member] | Mar. 31, 2013 Senior Notes [Member] Unsecured Debt [Member] 7.625% Senior Notes [Member] | Dec. 31, 2013 2013 and 2012 Acquisitions [Member] | Dec. 31, 2013 Earn-out Arrangements [Member] | Dec. 31, 2012 Earn-out Arrangements [Member] | Dec. 31, 2013 Earn-out Arrangements [Member] Accumulated Translation Adjustment [Member] | Dec. 31, 2012 Earn-out Arrangements [Member] Accumulated Translation Adjustment [Member] | Dec. 31, 2013 Auction Rate Securities [Member] | Dec. 31, 2012 Auction Rate Securities [Member] | Dec. 31, 2012 Auction Rate Securities [Member] Fair Value [Member] | Dec. 31, 2013 Auction Rate Securities [Member] Securities Redeemed or Sold [Member] | Dec. 31, 2013 Cash Surrender Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Non-Recurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value measurements, valuation techniques |  |  |  | The estimated fair values of the Company’s 4.875% Senior Notes, 7.625% Senior Notes, 2009 Convertible Notes and 2011 Convertible Notes are based on quoted market prices, a Level 1 input. |  |  | The fair value of such acquisition-related contingent consideration is based on management’s estimates and entity-specific assumptions and is evaluated on an on-going basis. |  |  |  | their respective fair values were estimated by an independent valuation firm, Houlihan Capital Advisors, LLC, using a probability weighted discounted cash flow model. |  |  |  | Cash surrender values of life insurance policies are based on current cash surrender values as quoted by insurance carriers.
Proceeds from sale and redemption of available-for-sale securities | $ 14,956,000 | $ 0 | $ 4,600,000 |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |
Net realized gain, available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |
Fair value, available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  | 14,400,000 |  |
Unrealized losses, net, available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |
Number of acquisitions |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |
Additions from new business combinations, contingent consideration |  |  |  |  |  |  | 30,000,000 | 66,700,000 |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  |  |  |  | 8,500,000 | 3,800,000 |  |  |  |  |  |  |
Foreign currency translation adjustments, contingent consideration |  |  |  |  |  |  |  |  | 2,200,000 | 100,000 |  |  |  |  |
Loss on extinguishment of debt | $ 5,624,000 | $ 0 | $ 0 |  | $ 5,600,000 |  |  |  |  |  |  |  |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition This element represents the net excess or deficiency of the fair value of an investment (security, contract) over or under its cost (face amount, notional amount), respectively, which excess value or deficiency has not been recognized in earnings of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6955306&loc=SL6090603-123010 + Details
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