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Debt (Long Term Debt Instruments) (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
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Capital Lease Obligations [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, weighted average interest rate | 2.70% |  |  |  |
Loans Payable [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, weighted average interest rate | 3.10% |  |  |  |
New 4.0% Notes [Member] | Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 4.00% |  |  |  |
Principal amount | $ 105,322 | [1] | $ 105,300 | $ 105,322 | [1]
New 4.25% Notes [Member] | Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 4.25% |  |  |  |
Principal amount | 97,000 | [1] | 97,000 | 97,000 | [1]
Original 4.0% Notes [Member] | Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 4.00% |  |  |  |
Principal amount | 9,600 | [2] |  | 9,700 | [2]
Original 4.25% Notes [Member] | Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 4.25% |  |  |  |
Principal amount | 3,000 | [2] |  | 3,000 | [2]
Unsecured Debt [Member] | 4.875% Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 4.875% |  |  |  |
Principal amount | 400,000 |  |  |  |
Unsecured Debt [Member] | 7.625% Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate |  |  | 7.625% |  |
Principal amount |  |  | $ 150,000 |  |
[1] | Dilutive shares associated with the New Convertible Notes are attributable to the weighted average premium value, in shares, of the conversion shares underlying the New Convertible Notes in excess of the respective principal amounts thereof.
[2] | Dilutive shares associated with the Original Convertible Notes are attributable to the underlying principal amounts.

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant