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Business Combinations - Schedule of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Apr. 30, 2014
Apr. 30, 2013
Dec. 31, 2015
Business Acquisition [Line Items]        
Cash used in acquisitions, net of cash acquired $ 360 $ 8,305 $ 25,225  
Excess purchase price to be allocated to goodwill 119,170 119,139 115,928 $ 118,976
BBI Acquisition [Member]        
Business Acquisition [Line Items]        
Cash used in acquisitions, net of cash acquired 314 7,860 25,225  
Common stock issued     2,650  
Other non-cash considerations   555    
Contingent consideration and holdbacks 67 1,653 33  
Total 381 10,068 27,908  
Current assets   814 1,422  
Equipment 99 2,010 9,423  
Other liabilities, net   (241) (7,009)  
Intangible assets 251 4,302 9,850  
Fair value of assets acquired and liabilities assumed 350 6,885 13,686  
Excess purchase price to be allocated to goodwill $ 31 $ 3,183 $ 14,222