The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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- Definition

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

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- Definition

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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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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No definition available.

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Subsequent Event - Additional Information (Detail) $ in Thousands		1 Months Ended
	Jul. 26, 2018 USD ($)	Jul. 31, 2013 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Debt instrument face value			$ 160,078	$ 156,647
4.25% Convertible Senior Notes (due 2018)
Subsequent Event [Line Items]
Debt instrument, maturity date		Aug. 01, 2018
Debt instrument, interest rate		4.25%	4.25%	4.25%
Debt instrument face value		$ 100,000	$ 21,178	$ 21,178
3.25% Convertible Senior Notes (due 2020)
Subsequent Event [Line Items]
Debt instrument, interest rate			3.25%	3.25%
Debt instrument face value			$ 25,900	$ 22,469
Subsequent Event \| 4.25% Convertible Senior Notes (due 2018)
Subsequent Event [Line Items]
Debt amount converted	$ 8,000
Debt instrument, maturity date	Aug. 01, 2018
Debt instrument, interest rate	4.25%
Subsequent Event \| 3.25% Convertible Senior Notes (due 2020)
Subsequent Event [Line Items]
Debt instrument, maturity date	Nov. 01, 2020
Debt instrument, interest rate	3.25%
Conversion rate in share per $1000 principal amount of notes	322.2688
Debt instrument face value	$ 8,000