Debt - Summary of Long-Term Debt and Related Weighted Average Interest Rates (Parenthetical) (Detail)	Jun. 30, 2019	Dec. 31, 2018	Jun. 15, 2017
Senior Notes, 6.00%, due 2025 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate stated, percentage	6.00%	6.00%	6.00%

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant