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Investments - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financial Instruments [Line Items] |  |  |
Period cash equivalents and short-term investments have been in continuous unrealized loss position, years, maximum | 1 year |  |
Period cash equivalents and long-term investments have been in continuous unrealized loss position, years, minimum | 1 year |  |
Unrealized gains (losses) on investments | $ 27 | $ 350 | $ 13
CCKF [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Non controlling interest | $ 3,900 |  |
Percentage of investment in equity affiliate | 30.70% |  |
Income (loss) from investment in affiliate | $ (300) |  |
CCKF [Member] | Maximum [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Income (loss) from investment in affiliate |  | $ 100 |
Municipal Bonds [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Period debt obligations mature, years, maximum | 1 year |  |
Unrealized gains (losses) on investments | $ 500 |  |

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- Definition The minimum length of time, in years, that the amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature greater than one year or operating cycle, if longer, are in a continuous unrealized loss/gain position. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 2: 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 + Details
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