Debt - Fair Value - Additional Information (Detail) - Level 2 $ in Millions	Jun. 30, 2019 USD ($)
2027 Notes
Debt Instrument [Line Items]
Fair value of long term debt	$ 423.4
2024 Notes
Debt Instrument [Line Items]
Fair value of long term debt	597.2
2024 Term Loan
Debt Instrument [Line Items]
Fair value of long term debt	$ 156.8

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

No definition available.

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant