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Long-Term Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 9 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 1 Months Ended |  | 1 Months Ended | 9 Months Ended |  |  | 9 Months Ended |
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Jun. 12, 2008 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Jan. 09, 2012 Sun Trust Term Loan [Member] | Sep. 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] | Sep. 30, 2013 Sun Trust Revolver [Member] | Sep. 30, 2013 JPM Term Loan [Member] | Sep. 30, 2013 Wells Fargo Revolver [Member] | Jun. 30, 2013 Wells Fargo Revolver [Member] Beecher Acquisition [Member] | Sep. 30, 2013 Bank Of America Loan Term Loan [Member] | Jun. 30, 2013 Bank Of America Loan Term Loan [Member] Beecher Acquisition [Member] | Sep. 30, 2013 Master Agreement [Member] | Dec. 31, 2012 Master Agreement [Member] | Sep. 30, 2013 Master Agreement [Member] Series C [Member] | Sep. 30, 2013 Master Agreement [Member] Series D [Member] | Sep. 30, 2013 Master Agreement [Member] Series E [Member] | Oct. 12, 2012 New Master Agreement [Member] | Sep. 30, 2013 New Master Agreement [Member] | Jun. 12, 2008 Line of Credit [Member] | Sep. 30, 2013 Line of Credit [Member] | Sep. 30, 2013 Line of Credit [Member] Sun Trust Revolver [Member] | Sep. 30, 2013 Line of Credit [Member] Wells Fargo Revolver [Member] | Sep. 30, 2013 Line of Credit [Member] Bank Of America Loan Term Loan [Member] | Sep. 30, 2013 LIBOR [Member] Minimum [Member] | Sep. 30, 2013 LIBOR [Member] Maximum [Member] | Sep. 30, 2013 Private Placement [Member] | Dec. 31, 2012 Private Placement [Member] | Sep. 30, 2013 Private Placement [Member] Series A [Member] | Sep. 30, 2013 Private Placement [Member] Series B [Member] | Sep. 30, 2013 Private Placement [Member] Senior Notes[Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding |  | $ 480,000,000 |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 | $ 150,000,000 | $ 25,000,000 | $ 25,000,000 | $ 100,000,000 |  | $ 0 |  |  |  |  |  |  |  | $ 200,000,000 | $ 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 |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2016 |  | Dec. 31, 2016 |  |  |  | Dec. 22, 2016 | Jan. 15, 2015 | Sep. 15, 2018 |  |  |  |  | Dec. 31, 2016 |  |  |  |  |  |  | Sep. 15, 2011 | 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 years |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |
Reduction in maximum principal amount |  | 31,863,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, extended maturity date | Jun. 03, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  | 1.00% | 1.00% |  |  |  |  |  |  |
Letter of credit usage fee, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.40% |  | 1.40% | 1.40% |  |  |  |  |  |  |
LIBOR below base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  | 1.00% |  |  |  |  |  |  |  |
Availability fees, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.175% |  | 0.175% |  |  |  |  |  |  |  |
Availability fees, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  | 0.25% |  |  |  |  |  |  |  |
Interest rate, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  | 1.00% |  |  |  |  |  |  |  |
Interest rate, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.40% |  | 1.40% |  |  |  |  |  |  |  |
Adjusted LIBOR Rate |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving and term loan |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility remaining amount |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |
30-day LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.18% | 0.18% |  |  |  |  |
30-day Adjusted LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.19% | 0.19% |  |  |  |  |

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- Definition Adjusted LIBOR rate + References No definition available. + Details
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- Definition Debt instrument, revolving and term loan + References No definition available. + Details
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- Definition Fees On Loans Maximum + References No definition available. + Details
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- Definition Fees On Loans Minimum + References No definition available. + Details
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- Definition Increase in Lending Commitment Amount + References No definition available. + Details
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- Definition Length of the issuance period of long-term debt. + References No definition available. + Details
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- Definition Letter Of Credit Usage Fee Maximum + References No definition available. + Details
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- Definition Letter Of Credit Usage Fee Minimum + References No definition available. + Details
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- Definition LIBOR rate + References No definition available. + Details
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- Definition L I B O R rate, alternative above base rate + References No definition available. + Details
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- Definition L I B O R Rate Below Base Rate + References No definition available. + Details
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- Definition Line Of Credit Facility Decrease In Borrowing Capacity + References No definition available. + Details
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- Definition Line of credit facility, extended maturity date + References No definition available. + Details
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- Definition Line of credit facility, increase in borrowing capacity + References No definition available. + Details
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- Definition Maximum shelf facility capacity + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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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 Maximum 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 Minimum 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the debt instrument was issued, in CCYY-MM-DD format. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -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 The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 02 -Paragraph 19, 20, 22 -Article 5 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 + 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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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Balance Type: | credit
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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + 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 Carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion. + 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) -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 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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