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.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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Represents the principal amount increment used to determine the number of shares received in the event of a conversion of convertible debt.

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Represents the number of shares each $1000 in principal amount of convertible debt can be converted into in the event of conversion.

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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.

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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.

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For convertible debt which is redeemable by the company, this represents the redemption price as a percent of principal amount to be redeemed.

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Debt - Additional Information (Detail) (USD $)	1 Months Ended		3 Months Ended
Debt - Additional Information (Detail) (USD $)	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