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Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 17, 2012 | Sep. 26, 2012 | Jun. 30, 2013
Debt Instrument [Line Items] |  |  |
Convertible Debt, Conversion Rate, Shares Per $1000 In Principal Amount |  | 60.8467 | 60.8467
Convertible Debt, Conversion Rate, Principal Amount Increment |  | $ 1,000 | $ 1,000
Debt Instrument, Convertible, Conversion Price (in Dollars per share) |  | $ 16.43 | $ 16.43
Convertible Debt, Redemption Terms, Common Stock Market Price As a Percent of the Conversion Price |  | 130.00% |
Convertible Debt, Redemption Terms, Redemption Price As Percent of Principal Amount to be Redeemed |  | 100.00% |
Convertible Debt, Redemption Terms, "Make Whole Premium" Payment, Discount Rate |  | 4.50% |
Embedded Derivative, Fair Value of Embedded Derivative Liability |  |  | 0
Debt Portion of Convertible Note [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Issuance Cost | 500,000 | 3,600,000 | 4,100,000
Proceeds from Debt, Net of Issuance Costs | 14,000,000 |  |
Equity Portion of Convertible Note [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Issuance Cost | 100,000 | 1,100,000 | 1,200,000
Proceeds from Debt, Net of Issuance Costs | 4,200,000 |  |
Convertible Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% | 4.50%
Debt Instrument, due date |  | Oct. 01, 2017 | Oct. 01, 2017
Proceeds from Debt, Net of Issuance Costs | 18,200,000 |  |
Convertible Debt [Member] | Public Offering [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance Of Debt, Principal Amount |  | 125,000,000 |
Convertible Debt [Member] | Underwriters' Exercise of Overallotment Option [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance Of Debt, Principal Amount | 18,800,000 |  |
Portion of Debt Issuance Allocated to Long-Term Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Convertible Debt |  | 92,800,000 | 106,800,000
Portion of Debt Issuance Allocated to Equity [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  | $ 27,500,000 | $ 31,700,000

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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + 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(a)(2)) -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 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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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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- 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 debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References No definition available. + Details
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- Definition Represents the principal amount increment used to determine the number of shares received in the event of a conversion of convertible debt. + References No definition available. + Details
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- Definition Represents the number of shares each $1000 in principal amount of convertible debt can be converted into in the event of conversion. + References No definition available. + Details
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- Definition For convertible debt which may be redeemed by the company, this represents the minimum common stock market price as a percent of the conversion price before the company may redeem. + References No definition available. + Details
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- Definition For convertible debt which is redeemable by the company, this represents the discount rate used to determine the amount of "make whole premium" payment in the event of redemption. + References No definition available. + Details
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- Definition For convertible debt which is redeemable by the company, this represents the redemption price as a percent of principal amount to be redeemed. + References No definition available. + Details
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