Additional disclosures on cash flow information and non-cash activities (Parenthetical) (Detail) (USD $)				3 Months Ended
Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014 Fixed Rate 700 Percent Notes Due July 2019 [Member]	Jun. 30, 2014 Fixed Rate 700 Percent Notes Due July 2019 [Member]	Dec. 31, 2013 Fixed Rate 700 Percent Notes Due July 2019 [Member]
Schedule of Cash Flow, Supplemental [Line Items]
Senior Long Term Notes				$ 450,000,000	$ 450,000,000	$ 0
Debt Issuance Costs				9,000,000
Securities Trades Receivables	$ 77,618,000	$ 71,680,000	$ 85,746,000	$ 441,000,000

Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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)

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

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