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Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 107,872
Valuation Adjustment | 8,514
Fair Value | 99,358
Auction Rate Securities Purchase Commitment [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 13,072
Valuation Adjustment | 1,037
Fair Value | 12,035
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 7,582
Valuation Adjustment | 424
Fair Value | 7,158
Valuation Technique | Discounted Cash Flow
Auction Rate Securities Purchase Commitment [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 538
Valuation Adjustment | 80
Fair Value | 458
Valuation Technique | Discounted Cash Flow
Auction Rate Securities Purchase Commitment [Member] | Municipal Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 4,952
Valuation Adjustment | 533
Fair Value | 4,419
Valuation Technique | Discounted Cash Flow
Auction Rate Securities Owned [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 94,800
Valuation Adjustment | 7,477
Fair Value | 87,323
Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 74,400
Valuation Adjustment | 4,392
Fair Value | 70,008
Valuation Technique | Discounted Cash Flow
Auction Rate Securities Owned [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 10,400
Valuation Adjustment | 1,118
Fair Value | 9,282
Valuation Technique | Discounted Cash Flow
Discount Rate | 2.76%
Duration | 4 years 6 months
Current Yield | 0.19%
Auction Rate Securities Owned [Member] | Municipal Auction Rate Securities 02 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 5,975
Valuation Adjustment | 624
Fair Value | 5,351
Valuation Technique | Secondary Market Trading Activity
Observable trades in inactive market for in portfolio securities | 89.60%
Auction Rate Securities Owned [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 400
Valuation Adjustment | 60
Fair Value | 340
Valuation Technique | Discounted Cash Flow
Discount Rate | 3.40%
Duration | 7 years
Current Yield | 0.98%
Auction Rate Securities Owned [Member] | Other Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 3,625
Valuation Adjustment | 1,283
Fair Value | $ 2,342
Valuation Technique | Secondary Market Trading Activity
Observable trades in inactive market for in portfolio securities | 64.60%
Auction Rate Securities Owned [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.54%
Duration | 4 years
Current Yield | 0.09%
Auction Rate Securities Owned [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.10%
Current Yield | 0.46%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.82%
Duration | 4 years
Current Yield | 0.28%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.76%
Duration | 4 years 6 months
Current Yield | 0.19%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Municipal Auction Rate Securities 02 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Observable trades in inactive market for in portfolio securities | 89.60%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.40%
Duration | 7 years
Current Yield | 0.98%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Other Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Observable trades in inactive market for in portfolio securities | 64.60%
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Duration | 4 years
Auction Rate Securities Purchase Commitment [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.40%
Duration | 7 years
Current Yield | 0.98%
Auction Rate Securities Purchase Commitment [Member] | Municipal Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.76%
Duration | 4 years 6 months
Current Yield | 0.19%
Auction Rate Securities Purchase Commitment [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.54%
Current Yield | 0.09%
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.10%
Current Yield | 0.46%
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.82%
Duration | 4 years
Current Yield | 0.28%
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.40%
Duration | 7 years
Current Yield | 0.98%
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Municipal Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.76%
Duration | 4 years 6 months
Current Yield | 0.19%
Auction Rate Securities [Member] | Fair Value, Valuation Scenario Two [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Change In Discount Rate | 0.50%
Auction Rate Securities [Member] | Fair Value, Valuation Scenario One [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Change In Discount Rate | 0.25%

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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