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Long-Term Debt - Additional Information (Detail) (USD $) | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  | 1 Months Ended |  |  | 9 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Sun Trust Term Loan [Member] | Sep. 30, 2012 Sun Trust Revolver [Member] | Sep. 30, 2012 JPMorgan Chase Bank, N.A. [Member] | Sep. 30, 2012 JPM Bridge Facility [Member] | Sep. 30, 2012 JPM Term Loan [Member] | Sep. 30, 2012 Line of Credit [Member] | Sep. 30, 2011 Line of Credit [Member] | Sep. 30, 2012 Line of Credit [Member] Sun Trust Revolver [Member] | Sep. 30, 2012 Master Agreement [Member] Y | Dec. 31, 2011 Master Agreement [Member] | Sep. 30, 2012 Master Agreement [Member] Series C [Member] | Sep. 30, 2012 Master Agreement [Member] Series D [Member] | Sep. 30, 2012 Master Agreement [Member] Series E [Member] | Sep. 30, 2012 LIBOR [Member] | Sep. 30, 2012 New Master Agreement [Member] | Dec. 31, 2011 New Master Agreement [Member] | Oct. 31, 2012 New Master Agreement [Member] Subsequent Event [Member] Y | Sep. 30, 2012 Private Placement [Member] Repayment of Debt [Member] | Dec. 31, 2011 Private Placement [Member] Repayment of Debt [Member] | Sep. 30, 2012 Private Placement [Member] Series A [Member] | Sep. 30, 2012 Private Placement [Member] Series B [Member] | Sep. 30, 2011 Private Placement [Member] Senior Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding | $ 450,000,000 | $ 250,000,000 |  |  |  |  |  |  |  |  | $ 150,000,000 | $ 150,000,000 | $ 25,000,000 | $ 25,000,000 | $ 100,000,000 |  | $ 0 | $ 0 |  | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 200,000,000
Debt instrument, issuance date |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 22, 2006 | Feb. 01, 2008 | Sep. 15, 2011 |  |  |  |  |  |  | Sep. 15, 2004 | Jul. 15, 2004 |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.66% | 5.37% | 4.50% |  |  |  |  |  |  | 5.57% | 6.08% |
Debt instrument, maturity date |  |  |  |  |  | Feb. 03, 2012 |  |  |  | Dec. 31, 2016 |  |  | Dec. 22, 2016 | Jan. 15, 2015 | Sep. 15, 2018 |  |  |  |  |  |  |  | Jul. 15, 2014 |
Notes redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |
Maximum shelf facility capacity |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |
Length of the issuance period of long-term debt (in years) |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  | 3 |  |  |  |  |
Long-term debt, maturities, repayment terms, maximum number of years |  |  |  |  |  |  |  |  |  |  | ten |  |  |  |  |  |  |  | Ten years |  |  |  |  |
Lending commitment amount |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential maximum increase in lending commitment amount |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maturity date | Dec. 11, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, extended maturity date | June 3, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility in the maximum principal amount |  |  | 150,000,000 | 100,000,000 |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in maximum principal amount |  |  |  |  |  |  |  | 20,000,000 | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving and term loan |  |  | 100,000,000 | 50,000,000 | 50,000,000 | 50,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in revolving credit facility |  |  | $ 50,000,000 | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit usage fee, minimum |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit usage fee, maximum |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR below base rate |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Availability fees, minimum |  |  |  |  |  |  |  | 0.175% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Availability fees, maximum |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, minimum |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, maximum |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted LIBOR Rate |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
30-day LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.2305% |  |  |  |  |  |  |  |
30-day Adjusted LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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