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Summary of significant accounting policies - Additional Information (Detail) | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 Peoples' Republic of China [Member] USD ($) | Dec. 31, 2011 Peoples' Republic of China [Member] USD ($) | Dec. 31, 2012 UNITED STATES [Member] USD ($) | Dec. 31, 2011 UNITED STATES [Member] USD ($) | Dec. 31, 2012 UBS Jersey Call Certificate [Member] USD ($) Unit | Dec. 31, 2012 Non Capital Preservation Wealth Management Product [Member] CNY | Dec. 31, 2011 Continuing Operations [Member] UNITED STATES [Member] USD ($) | Dec. 31, 2011 Discontinuing Operations [Member] UNITED STATES [Member] USD ($) | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Minimum [Member] Non Capital Preservation Wealth Management Product [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Maximum [Member] Non Capital Preservation Wealth Management Product [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and bank deposits |  |  |  | $ 2,009,000 | $ 4,438,000 | $ 5,200,000 | $ 193,000 |  |  | $ 39,000 | $ 154,000 |  |  |  |
Financial Product , Units |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |
Financial Product , Par value |  |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |
Financial Product , Fair value |  |  |  |  |  |  |  | 2,530,000 |  |  |  |  |  |  |
Financial Product, estimated maximum annual yield |  |  |  |  |  |  |  |  |  |  |  |  | 2.15% |  | 3.55%
Financial Product, Term |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Financial Product, Par Value |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |
Proceeds from redemption of financial product |  |  |  |  |  |  |  |  | 2,025,000 |  |  |  |  |  |
FDIC Insurance limit | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life minimum years |  |  |  |  |  |  |  |  |  |  |  | 6 months |  | 4 years 4 months 24 days |
Advertising service revenue on a straight-line basis |  |  |  |  |  |  |  |  |  |  |  | 1 month |  | 2 years |
Advertising and promotion costs | $ 3,573,000 | $ 3,852,000 | $ 1,834,000 |  |  |  |  |  |  |  |  |  |  |  |
Contributions to PRC employee |  |  |  |  |  |  |  |  |  |  |  | 18.00% |  | 20.00% |
Employer contribution to the scheme | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized income tax positions | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising service revenue rate | 10.00% | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Total long lived assets rate | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1, 2, 3 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 1, 2, 3, 7, 11 -IssueDate 2006-05-01 -Chapter 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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