Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Changes in Liability Related to Unrecognized Tax Benefits (Parenthetical) (Detail)

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Income Taxes - Summary of Changes in Liability Related to Unrecognized Tax Benefits (Parenthetical) (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Unrecognized Tax Benefits [Line Items]        
Accrued interest and penalties $ 1.1 $ 1.2 $ 1.1 $ 2.4
State and Local Jurisdiction [Member]        
Schedule Of Unrecognized Tax Benefits [Line Items]        
Net operating losses $ 0.6 $ 0.8 $ 1.0