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Intangible Assets, Net - Additional Information (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
May. 29, 2015
Intangible Assets [Line Items]    
Intangible assets subject to acquisition $ 57,226  
Amortization of intangible assets 4,090  
Amortization expense 3,013  
Accumulated amortization 5,397  
Caprock [Member]    
Intangible Assets [Line Items]    
Intangible assets subject to acquisition 2,490 $ 2,490
Amortization of intangible assets 203  
Amortization expense 88  
Customer Relationship [Member] | Caprock [Member]    
Intangible Assets [Line Items]    
Intangible assets subject to acquisition $ 2,430  
Preliminary estimated intangible assets useful life 12 years  
Trade Name [Member] | Caprock [Member]    
Intangible Assets [Line Items]    
Intangible assets subject to acquisition $ 60  
Preliminary estimated intangible assets useful life 1 year