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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
ARS Purchase Commitments [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.62%
Current Yield | 0.27%
ARS Purchase Commitments [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.65%
Current Yield | 1.31%
ARS Purchase Commitments [Member] | Other Member [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 [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.62%
Current Yield | 0.27%
Auction Rate Securities [Member] | Auction Rate Securities Other than Student Loan [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Observable trades in inactive market for in portfolio securities | 85.50%
Auction Rate Securities [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.65%
Current Yield | 1.31%
Auction Rate Securities [Member] | Other Member [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Observable trades in inactive market for in portfolio securities | 64.60%
Minimum [Member] | ARS Purchase Commitments [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.38%
Current Yield | 0.10%
Minimum [Member] | Auction Rate Securities [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.38%
Current Yield | 0.10%
Maximum [Member] | ARS Purchase Commitments [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.88%
Current Yield | 0.53%
Maximum [Member] | Auction Rate Securities [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.88%
Current Yield | 0.53%
Weighted Average [Member] | ARS Purchase Commitments [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.65%
Duration | 4 years
Current Yield | 0.33%
Weighted Average [Member] | ARS Purchase Commitments [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.62%
Duration | 4 years 6 months
Current Yield | 0.27%
Weighted Average [Member] | ARS Purchase Commitments [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.65%
Duration | 7 years
Current Yield | 1.31%
Weighted Average [Member] | ARS Purchase Commitments [Member] | Other Member [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Observable trades in inactive market for in portfolio securities | 64.60%
Weighted Average [Member] | Auction Rate Securities [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.65%
Duration | 4 years
Current Yield | 0.33%
Weighted Average [Member] | Auction Rate Securities [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.62%
Duration | 4 years 6 months
Current Yield | 0.27%
Weighted Average [Member] | Auction Rate Securities [Member] | Auction Rate Securities Other than Student Loan [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Observable trades in inactive market for in portfolio securities | 85.50%
Weighted Average [Member] | Auction Rate Securities [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.65%
Duration | 7 years
Current Yield | 1.31%
Weighted Average [Member] | Auction Rate Securities [Member] | Other Member [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Observable trades in inactive market for in portfolio securities | 64.60%
Level 3 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 120,684
Valuation Adjustment | 9,106
Fair Value | 111,579
Level 3 [Member] | Auction Rate Securities Owned [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 91,630
Valuation Adjustment | 6,506
Fair Value | 85,124
Level 3 [Member] | Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 74,075
Valuation Adjustment | 3,752
Fair Value | 70,323
Valuation Technique | Discounted Cash Flow
Level 3 [Member] | Auction Rate Securities Owned [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 8,230
Valuation Adjustment | 813
Fair Value | 7,417
Valuation Technique | Discounted Cash Flow
Level 3 [Member] | Auction Rate Securities Owned [Member] | Auction Rate Securities Other than Student Loan [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 5,975
Valuation Adjustment | 866
Fair Value | 5,109
Valuation Technique | Secondary Market Trading Activity
Level 3 [Member] | Auction Rate Securities Owned [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 525
Valuation Adjustment | 75
Fair Value | 450
Valuation Technique | Discounted Cash Flow
Level 3 [Member] | Auction Rate Securities Owned [Member] | Auction Rate Securities Owned other [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 2,825
Valuation Adjustment | 1,000
Fair Value | 1,825
Valuation Technique | Secondary Market Trading Activity
Level 3 [Member] | ARS Purchase Commitments [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 29,054
Valuation Adjustment | 2,600
Fair Value | 26,455
Level 3 [Member] | ARS Purchase Commitments [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 10,746
Valuation Adjustment | 535
Fair Value | 10,211
Valuation Technique | Discounted Cash Flow
Level 3 [Member] | ARS Purchase Commitments [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 16,221
Valuation Adjustment | 1,603
Fair Value | 14,619
Valuation Technique | Discounted Cash Flow
Level 3 [Member] | ARS Purchase Commitments [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 1,304
Valuation Adjustment | 185
Fair Value | 1,119
Valuation Technique | Discounted Cash Flow
Level 3 [Member] | ARS Purchase Commitments [Member] | Auction Rate Securities Owned other [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 783
Valuation Adjustment | 277
Fair Value | $ 506
Valuation Technique | Secondary Market Trading Activity

X
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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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