Debt - Deferred Financing Costs - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
OLLC $2.0 billion revolving credit facility, variable-rate, due March 2018
Debt Instrument [Line Items]
Deferred financing fees	$ 1.3
2021 Senior Notes, fixed-rate, due May 2021 [Member]
Debt Instrument [Line Items]
Deferred financing fees	8.5
2022 Senior Notes, fixed-rate, due August 2022 [Member]
Debt Instrument [Line Items]
Deferred financing fees	$ 5.7