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Acquisitions - Additional Information (Detail) - Gilliland Gold Young [Member] - USD ($)
$ in Millions
Mar. 01, 2016
Mar. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Acquired cash $ 7.5    
Amount related to transaction cost $ 0.9 $ 0.3 $ 0.6
Percentage of interests acquired 100.00%    
Acquired account receivables $ 2.9    
Cash paid for acquisitions, net of cash required $ 83.4