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Quarterly Financial Information - Summary of Selected Financial Information (Detail) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 16, 2015
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information [Line Items]          
Total amortization expense     $ 10.3 $ 6.4 $ 6.8
New World Systems Corporation [Member]          
Quarterly Financial Information [Line Items]          
Expenses incurred in acquisition $ 5.9 $ 5.5      
Total amortization expense   $ 3.5