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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - Zhongli (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 15, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 220,163 $ 165,861   $ 129,888
Zhongli [Member]        
Business Acquisition [Line Items]        
Current assets (including cash of $1,025)     $ 16,223  
Property and equipment     1,477  
Goodwill     4,752  
Intangible – finite life     4,262  
Intangible – indefinite life     960  
Total assets acquired     27,674  
Current liabilities assumed     (1,840)  
Deferred tax liabilities     (1,739)  
Net assets acquired     $ 24,095