XML 69 R55.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments and Contingencies - Additional Information (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2017 $ 21.4
2018 75.6
2019 81.9
2020 86.2
2021 75.9
Thereafter $ 303.0