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Long-Term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2013 | Jan. 25, 2013 | Jan. 17, 2013
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount |  |  |  | $ 5,250 | $ 35,000
Underwriting and issuance costs | 1,560 |  | 1,525 |  |
Prospectus supplement date |  |  | Jan. 10, 2013 |  |
Quarterly payments dates, one |  |  | January 30 |  |
Quarterly payments dates, two |  |  | April 30 |  |
Quarterly payments dates, three |  |  | July 30 |  |
Quarterly payments dates, four |  |  | October 30 |  |
Quarterly payment start date |  |  | Apr. 30, 2013 |  |
Notes redemption date |  |  | Jan. 30, 2016 |  |
Redemption price as percentage of principal amount redeemed |  |  | 100.00% |  |
Interest expense with respect to the senior notes |  | 846 | 1,532 |  |
Amortization of debt issuance costs |  | 41 | 74 |  |
Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notice period for redemption of Notes |  |  | 60 days |  |
Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notice period for redemption of Notes |  |  | 30 days |  |
Unsecured Senior Note [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net proceeds after underwriting and issuance costs | 38,690 |  |  |  |
Maturity date of notes |  |  | Jan. 30, 2020 |  |
Fixed annual rate of interest |  |  |  |  | 8.00%
Interest expense with respect to the senior notes |  | $ 846 | $ 1,532 |  |
Effective interest rate |  | 8.70% | 8.70% |  |

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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