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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