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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
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Investments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | $ 5,946 | $ 12,954
Total Realized and Unrealized Gains (Losses) | (169) | 329
Purchases and Issuances | 4,052 |
Sales and Settlements | (503) | (504)
Transfers In (Out) | (620) |
Ending Balance | 8,706 | 12,779
Interest Rate Lock Commitments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 2,375 |
Total Realized and Unrealized Gains (Losses) | 663 |
Purchases and Issuances |  |
Sales and Settlements |  |
Transfers In (Out) |  |
Ending Balance | 3,038 |
Beginning Balance | 3,653 |
Total Realized and Unrealized Gains (Losses) | (749) |
Purchases and Issuances |  |
Sales and Settlements |  |
Transfers In (Out) |  |
Ending Balance | 4,402 |
Auction Rate Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 85,124 | 72,118
Total Realized and Unrealized Gains (Losses) | 1 | (690)
Purchases and Issuances | 3,200 | 4,250
Sales and Settlements | (3,300) | (3,125)
Transfers In (Out) |  |
Ending Balance | 85,025 | 72,553
Beginning Balance |  | 100
Total Realized and Unrealized Gains (Losses) |  |
Purchases and Issuances |  |
Sales and Settlements |  |
Transfers In (Out) |  |
Ending Balance |  | 100
Auction Rate Securities Commitments to Purchase [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 2,600 | 2,647
Total Realized and Unrealized Gains (Losses) | 395 | 553
Purchases and Issuances |  |
Sales and Settlements |  |
Transfers In (Out) |  |
Ending Balance | 2,205 | 2,094
Mortgage and Other Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance |  | 40
Total Realized and Unrealized Gains (Losses) |  | 7
Purchases and Issuances |  | 23
Sales and Settlements |  | (18)
Transfers In (Out) |  |
Ending Balance |  | 52
Municipal Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 236 | 239
Total Realized and Unrealized Gains (Losses) | (166) |
Purchases and Issuances |  |
Sales and Settlements |  |
Transfers In (Out) |  |
Ending Balance | $ 70 | $ 239

X
- 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 liabilities 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 Fair value measurement with unobservable inputs reconciliation recurring basis liabilities purchases issuances. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liabilities 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 Amount of transfers of financial instrument classified as a liability 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 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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