Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Summary of Investments (Parenthetical) (Detail)

v3.8.0.1
Fair Value Measurement - Summary of Investments (Parenthetical) (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Fair Value Disclosures [Abstract]  
Restricted cash and long term workers' compensation deposits $ 5.5