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Acquisitions - Consideration (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Combinations [Abstract]    
Weighted-average discount rates applied to cash flows   7.60%
Weighted-average residual capitalization rates   7.00%
Acquisition costs related to assets $ 0.7 $ 2.5