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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - Zhongli (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Goodwill $ 169,324 $ 167,547 $ 134,062
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, net 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