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Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ 3,188 | $ 0 | $ 3,188 | $ 0 | $ 3,833 | $ 3,653 |  | $ 100
Total Realized and Unrealized Gains (Losses) | 645 |  | 465 |  |  |  |  |
Purchases and Issuances |  |  |  | 100 |  |  |  |
Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  | 5,946 | 12,954 | 8,779 |  | 12,974 |
Total Realized and Unrealized Gains (Losses) | (254) | (413) | (341) | 210 |  |  |  |
Purchases and Issuances | 180 | 1,000 | 4,444 | 1,000 |  |  |  |
Sales and Settlements | (282) | (7,435) | (1,006) | (8,038) |  |  |  |
Transfers In (Out) | 0 | 0 | (620) | 0 |  |  |  |
Ending Balance | 8,423 | 6,126 | 8,423 | 6,126 | 8,779 |  | 12,974 |
Interest Rate Lock Commitments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  | 2,375 |  | 10,528 |  |  |
Total Realized and Unrealized Gains (Losses) | (5,017) |  | 3,136 |  |  |  |  |
Ending Balance | 5,511 |  | 5,511 |  | 10,528 |  |  |
Auction Rate Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  | 85,124 | 72,118 | 92,548 |  | 78,076 |
Total Realized and Unrealized Gains (Losses) | (645) | (245) | (971) | (437) |  |  |  |
Purchases and Issuances | 2,375 | 2,750 | 16,550 | 13,175 |  |  |  |
Sales and Settlements | (6,955) | (150) | (13,380) | (4,425) |  |  |  |
Ending Balance | 87,323 | 80,431 | 87,323 | 80,431 | 92,548 |  | 78,076 |
Auction Rate Securities Purchase Commitment [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 1,037 | 2,412 | 1,037 | 2,412 | 1,514 | 2,600 | 2,329 | 2,647
Total Realized and Unrealized Gains (Losses) | 477 | (83) | 1,563 | 235 |  |  |  |
Mortgage and Other Asset-Backed Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 40 |  |  | 67 |
Total Realized and Unrealized Gains (Losses) |  | 0 |  | 0 |  |  |  |
Purchases and Issuances |  | 0 |  | 0 |  |  |  |
Sales and Settlements |  | (8) |  | (8) |  |  |  |
Transfers In (Out) |  | (59) |  | (32) |  |  |  |
Ending Balance |  | 0 |  | 0 |  |  | 67 |
Municipal Obligations [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  | 236 | 239 | 52 |  | 236 |
Total Realized and Unrealized Gains (Losses) | 77 | 0 | (107) | (3) |  |  |  |
Purchases and Issuances |  | 0 |  | 0 |  |  |  |
Sales and Settlements |  | 0 |  | 0 |  |  |  |
Ending Balance | $ 129 | $ 236 | $ 129 | $ 236 | $ 52 |  | $ 236 |

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- Definition Fair value assets measured on recurring basis change in realized and unrealized gain (loss) included in other income. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset purchases sales issuances settlements. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset sales settlements. + References No definition available. + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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