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Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified |  | 6 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 2014 Forecast [Member] | Jul. 28, 2014 Subsequent Event [Member] | Jul. 07, 2014 Subsequent Event [Member] | Jul. 28, 2014 Subsequent Event [Member] Currently Reported [Member]
Subsequent Event [Line Items] |  |  |  |  |
Principal amount of its outstanding 2010 Notes for cash |  |  |  | $ 17.4 |
Non-operating loss on repurchase transaction |  | 0.8 |  |  |
Interest expense expected to decrease |  | 0.4 |  |  |
Diluted share expected to decrease |  | 380,000 |  |  |
Unsecured credit facility | $ 275 |  | $ 400 |  | $ 275
Unsecured credit facility expiration date |  |  | 2019-07 |  |

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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
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- Definition Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase. + References No definition available. + Details
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- Definition This is the amount of interest expense incurred during the reporting period as a result of repurchase agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 405 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710549&loc=d3e44076-110983 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 9 + Details
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- Details
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- Definition Carrying value as of the balance sheet date of uncollateralized debt obligation (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 22 -Article 5 + Details
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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