Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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 02

-Paragraph 19, 20, 22

-Article 5

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)

-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 03

-Paragraph 13, 16

-Article 9

Name:	us-gaap_NotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Convertible Notes (Summary of Series 2012 Notes) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Feb. 12, 2014	Feb. 06, 2014	Dec. 31, 2013	Aug. 01, 2013	Jan. 31, 2012
Debt Instrument [Line Items]
Convertible Notes Payable, Carrying Value	$ 492,901			$ 395,280
Series 2012 Notes [Member]
Debt Instrument [Line Items]
Convertible Notes, Principal Balance Outstanding	48,311		48,300	180,000	180,000
Unamortized discount of liability component	(747)	(2,100)		(7,370)		(2,300)
Convertible Notes Payable, Carrying Value	$ 47,564			$ 172,630