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Fair Value Measurement - Summary of Marketable Securities Consist of Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Recorded Basis | $ 5,909 | $ 9,899
Recorded Basis | 19,787 | 16,748
Long-Term Available-for-Sale [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 5,953 | 9,870
Gross Unrealized Gains (Losses) | (44) | 29
Recorded Basis | 5,909 | 9,899
Corporate Bonds [Member] | Long-Term Available-for-Sale [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 1,879 | 9,111
Gross Unrealized Gains (Losses) | (27) | 28
Recorded Basis | 1,852 | 9,139
Fair Value Category | 2 |
Municipal Bonds [Member] | Long-Term Available-for-Sale [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 4,074 | 292
Gross Unrealized Gains (Losses) | (17) | 1
Recorded Basis | 4,057 | 293
Fair Value Category | 2 |
Held-to-Maturity [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Held-to-maturity, Cost | 0 | 467
Fair Value Category | 2 |
Held-to-maturity, Gross Unrealized Gains (Losses) | 0 | 0
Held-to-maturity, Recorded Basis | 0 | 467
Current Available-for-Sale [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 19,800 | 16,728
Gross Unrealized Gains (Losses) | (13) | 20
Recorded Basis | 19,787 | 16,748
Current Available-for-Sale [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 9,800 | 14,764
Gross Unrealized Gains (Losses) | (13) | 16
Recorded Basis | 9,787 | 14,780
Fair Value Category | 2 |
Current Available-for-Sale [Member] | Municipal Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 0 | 409
Gross Unrealized Gains (Losses) | 0 | 1
Recorded Basis | 0 | 410
Fair Value Category | 2 |
Current Available-for-Sale [Member] | Variable Rate Demand Notes (VRDN) [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 10,000 | 0
Gross Unrealized Gains (Losses) | 0 | 0
Recorded Basis | 10,000 | 0
Fair Value Category | 2 |
Current Available-for-Sale [Member] | U.S. Treasuries [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 0 | 1,555
Gross Unrealized Gains (Losses) | 0 | 3
Recorded Basis | $ 0 | $ 1,558
Fair Value Category | 1 |

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- Definition Held to maturity securities debt maturities gross unrealized gain losses. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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