Common Stock Strike Price Per Share

No definition available.

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- Definition

Conversion Price Per Share

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Details

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- Definition

Debt Instrument Conversion Condition Trading Days

+ References

No definition available.

+ Details

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- Definition

Debt Trading Price Principal Amount

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Effective Conversion Price Per Share

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Percentage Of Product Of Last Reported Sale Price Of Common Stock

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Principal Amount Of Convertible Debt Sold

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-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 210.5-02.30(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Period Type:	instant

- Definition

Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

+ 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 210.5-02.29)

-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 30

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Expiration, mandatory redemption, or due date, in CCYY-MM-DD format, of the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The name of the original debt issue that has been converted in a noncash (or part noncash) transaction during the accounting period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

No definition available.

+ Details

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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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- Definition

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section 45

-Paragraph 3

-Subparagraph (k)

-URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849

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- Details

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Convertible Senior Notes - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Dec. 17, 2013	Mar. 31, 2015	Dec. 31, 2014
Debt Disclosure [Line Items]
Additional paid-in capital		$ 541,157,000us-gaap_AdditionalPaidInCapital	$ 538,553,000us-gaap_AdditionalPaidInCapital
Common shares sold (shares)		66,000us-gaap_CommonStockValue	66,000us-gaap_CommonStockValue
2.75% Convertible Senior Notes Due 2018 [Member]
Debt Disclosure [Line Items]
Sale of convertible notes, principal amount	120,000,000
Conversion rate, shares (shares)		95
Conversion rate, price per share ($ per share)		$ 1,000
Money conversion price per share ($ per share)		$ 10.53
Interest rate	2.75%	2.75%
Convertible senior notes maturity date		Dec. 15, 2018
Net proceeds from convertible notes	115,400,000
Professional fee	4,600,000
Additional paid-in capital		13,100,000
Common shares converted value (shares)		11,400,000
Strike price per share ($ per share)		$ 14.03
Common shares sold (shares)		11,400,000
Threshold percentage of conversion price		130.00%
Convertible senior notes trading price		$ 1,000
Percentage of product of last reported sale price of common stock		98.00%
Convertible senior notes conversion description		Prior to June 15, 2018, holders may convert all or a portion of their 2018 Convertible Notes only under any of the following circumstances: (1) during any fiscal quarter (and only during such fiscal quarter), if, for at least 20 trading days (whether or not consecutive) during the 30 consecutive trading day period ending on the last trading day of the immediately preceding fiscal quarter, the last reported sale price of our common stock on such trading day is greater than or equal to 130% of the applicable conversion price on such trading day; (2) during the five consecutive business day period immediately following any five consecutive trading day period in which, for each trading day of that measurement period, the trading price per $1,000 principal amount of 2018 Convertible Notes for such trading day was less than 98% of the product of (i) the last reported sale price of our common stock on such trading day and (ii) the applicable conversion rate on such trading day; (3) upon the occurrence of certain corporate transactions; and (4) at any time prior to our stockholders’ approval to settle the 2018 Convertible Notes in our common shares and/or cash. On and after June 15, 2018, and until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or a portion of their 2018 Convertible Notes.
2.75% Convertible Senior Notes Due 2018 [Member] \| Minimum [Member]
Debt Disclosure [Line Items]
Debt convertible trading days		20 days
Debt convertible consecutive trading days		5 days
2.75% Convertible Senior Notes Due 2018 [Member] \| Maximum [Member]
Debt Disclosure [Line Items]
Debt convertible consecutive trading days		30 days