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Long-Term Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 6 Months Ended |  |  |  |  | 6 Months Ended |  | 6 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 6 Months Ended |  | 6 Months Ended | 1 Months Ended |  | 1 Months Ended | 6 Months Ended
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Jun. 12, 2008 | Jun. 30, 2012 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Private Placement [Member] | Dec. 31, 2012 Private Placement [Member] | Jun. 30, 2013 Private Placement [Member] Series A [Member] | Jun. 30, 2013 Private Placement [Member] Series B [Member] | Jun. 30, 2013 Private Placement [Member] Senior Notes[Member] | Jun. 30, 2013 JPM Term Loan [Member] | Jan. 09, 2012 Sun Trust Term Loan [Member] | Jun. 30, 2013 Sun Trust Term Loan [Member] | Jan. 09, 2012 JPM Bridge Facility [Member] | Jan. 09, 2012 JPMorgan Chase Bank, N.A. [Member] | Jan. 09, 2012 Sun Trust Revolver [Member] | Jun. 30, 2013 Sun Trust Revolver [Member] | Jun. 30, 2013 Master Agreement [Member] Y | Dec. 31, 2012 Master Agreement [Member] | Jun. 30, 2013 Master Agreement [Member] Series C [Member] | Jun. 30, 2013 Master Agreement [Member] Series D [Member] | Jun. 30, 2013 Master Agreement [Member] Series E [Member] | Oct. 12, 2012 New Master Agreement [Member] Y | Jun. 30, 2013 New Master Agreement [Member] | Jun. 12, 2008 Line of Credit [Member] | Jun. 30, 2013 Line of Credit [Member] | Jun. 30, 2013 Line of Credit [Member] Sun Trust Revolver [Member] | Jun. 30, 2013 LIBOR [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding |  |  | $ 450,000,000 | $ 450,000,000 | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 200,000,000 |  |  |  |  |  |  |  | $ 150,000,000 | $ 150,000,000 | $ 25,000,000 | $ 25,000,000 | $ 100,000,000 |  | $ 0 |  |  |  |
Debt instrument, issuance date |  |  |  |  |  |  | Sep. 15, 2004 | Jul. 15, 2004 |  |  |  |  |  |  |  |  |  |  | Dec. 22, 2006 | Feb. 01, 2008 | Sep. 15, 2011 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  | 5.57% | 6.08% |  |  |  |  |  |  |  |  |  |  | 5.66% | 5.37% | 4.50% |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Sep. 15, 2011 | Jul. 15, 2014 |  |  |  |  |  |  |  |  |  |  | Dec. 22, 2016 | Jan. 15, 2015 | Sep. 15, 2018 |  |  |  |  | Dec. 31, 2016 |
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 maturity, period length, maximum (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Maturity dates, not to exceed ten years |  |  |  |  | Maturity dates, not to exceed ten years |  |  |  |  |
Lending commitment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |
Potential maximum increase in lending commitment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |
Revolving credit facility in the maximum principal amount |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  | 100,000,000 |  |  |  |  |  |  |  | 75,000,000 |  |  |
Reduction in maximum principal amount |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |
Revolving credit facility, extended maturity date | Jun. 03, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving and term loan |  |  |  |  |  |  |  |  |  | 100,000,000 | 100,000,000 |  | 50,000,000 | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase in revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.19%
30-day Adjusted LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25%

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- Definition Contractual interest rate for funds borrowed, under the 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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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
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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 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 2: 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 Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: 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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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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