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Intangibles - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense for intangible assets $ 0.7 $ 0.2 $ 1.0 $ 0.3