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Acquisition Consideration Payable - Summary of Contingent Consideration (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration $ 116,761 $ 115,676
Consideration paid in cash 88,834 87,763
Consideration paid in stock 6,364 6,364
Extinguishment of consideration 3,131 3,032
Consideration extinguished on disposal 17,968 17,968
consideration payable 464 549
Payable in cash    99
Payable in stock 464 450
Qingdao Kaixiang [Member]
    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration 16,070 16,070
Consideration paid in cash 7,748 7,748
Consideration paid in stock 4,196 4,196
Extinguishment of consideration      
Consideration extinguished on disposal 4,126 4,126
consideration payable      
Payable in cash      
Payable in stock      
Wanshuizhiyuan [Member]
    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration 11,121 11,121
Consideration paid in cash 9,915 9,915
Consideration paid in stock      
Extinguishment of consideration      
Consideration extinguished on disposal 1,206 1,206
consideration payable      
Payable in cash      
Payable in stock      
Shenyang Jingli [Member]
    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration 18,092 18,092
Consideration paid in cash 16,655 16,655
Consideration paid in stock      
Extinguishment of consideration      
Consideration extinguished on disposal 1,437 1,437
consideration payable      
Payable in cash      
Payable in stock      
Haiya [Member]
    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration 9,002 9,002
Consideration paid in cash 5,970 5,970
Consideration paid in stock      
Extinguishment of consideration 3,032 3,032
Consideration extinguished on disposal      
consideration payable      
Payable in cash      
Payable in stock      
Shanghai Botang [Member]
    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration 36,176 35,091
Consideration paid in cash 35,712 34,641
Consideration paid in stock      
Extinguishment of consideration      
Consideration extinguished on disposal      
consideration payable 464 450
Payable in cash      
Payable in stock 464 450
HK Ad-Icon [Member]
    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration 2,414 2,414
Consideration paid in cash 1,847 1,847
Consideration paid in stock 468 468
Extinguishment of consideration 99   
Consideration extinguished on disposal      
consideration payable    99
Payable in cash    99
Payable in stock      
Wenzhou Rigao [Member]
    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration 8,380 8,380
Consideration paid in cash 4,770 4,770
Consideration paid in stock      
Extinguishment of consideration      
Consideration extinguished on disposal 3,610 3,610
consideration payable      
Payable in cash      
Payable in stock      
Wuxi Ruizhong [Member]
    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration 4,783 4,783
Consideration paid in cash 3,744 3,744
Consideration paid in stock      
Extinguishment of consideration      
Consideration extinguished on disposal 1,039 1,039
consideration payable      
Payable in cash      
Payable in stock      
Zhejiang Continental [Member]
    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent consideration 10,723 10,723
Consideration paid in cash 2,473 2,473
Consideration paid in stock 1,700 1,700
Extinguishment of consideration      
Consideration extinguished on disposal 6,550 6,550
consideration payable      
Payable in cash      
Payable in stock