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Acquisition consideration payable - Summary of Contingent Consideration (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | $ 115,676 | $ 115,563
Consideration paid in cash | 87,763 | 87,115
Consideration paid in stock | 6,364 | 5,210
Extinguishment of consideration | 3,032 |
Consideration extinguished on disposal | 17,968 |
Consideration payable | 549 | 23,238
Payable in cash | 99 | 16,820
Payable in stock | 450 | 6,418
Qingdao Kaixiang [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 16,070 | 16,183
Consideration paid in cash | 7,748 | 7,802
Consideration paid in stock | 4,196 | 4,225
Consideration extinguished on disposal | 4,126 |
Consideration payable |  | 4,156
Payable in cash | 4,126 | 4,156
Wanshuizhiyuan [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 11,121 | 11,093
Consideration paid in cash | 9,915 | 9,890
Consideration extinguished on disposal | 1,206 |
Consideration payable |  | 1,203
Payable in stock |  | 1,203
Shenyang Jingli [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 18,092 | 18,101
Consideration paid in cash | 16,655 | 16,663
Consideration extinguished on disposal | 1,437 |
Consideration payable |  | 1,438
Payable in cash | 1,437 |
Payable in stock |  | 1,438
Haiya [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 9,002 | 8,973
Consideration paid in cash | 5,970 | 5,951
Extinguishment of consideration | 3,032 |
Consideration payable |  | 3,022
Payable in cash |  | 1,178
Payable in stock |  | 1,844
Shanghai Botang [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 35,091 | 35,005
Consideration paid in cash | 34,641 | 34,556
Consideration payable | 450 | 449
Payable in stock | 450 | 449
HK Ad-Icon [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 2,414 | 2,410
Consideration paid in cash | 1,847 | 1,547
Consideration paid in stock | 468 | 269
Consideration payable | 99 | 594
Payable in cash | 99 | 594
Wenzhou Rigao [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 8,380 | 8,359
Consideration paid in cash | 4,770 | 4,759
Consideration extinguished on disposal | 3,610 |
Consideration payable |  | 3,600
Payable in cash |  | 2,116
Payable in stock |  | 1,484
Wuxi Ruizhong [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 4,783 | 4,774
Consideration paid in cash | 3,744 | 3,487
Consideration paid in stock |  | 716
Consideration extinguished on disposal | 1,039 |
Consideration payable |  | 571
Payable in cash | 322 | 571
Zhejiang Continental [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 10,723 | 10,665
Consideration paid in cash | 2,473 | 2,460
Consideration paid in stock | 1,700 |
Consideration extinguished on disposal | 6,550 |
Consideration payable |  | 8,205
Payable in cash | $ 8,250 | $ 8,205

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