Joint Ventures and Investments - Consolidated Joint Ventures (Parenthetical) (Detail) - Variable Interest Entity, Primary Beneficiary - Hydraulic IP Holdings LLC		1 Months Ended
		Apr. 30, 2018	Mar. 31, 2018
Schedule Of Investments [Line Items]
Company ownership interest	[1]		51.00%
Subsequent Event
Schedule Of Investments [Line Items]
Ownership interest acquired		49.00%
Ownership interest		100.00%

[1] The Company determined, in accordance with ASC 810, based on the corporate structure, voting rights and contributions of the Company and its respective joint venture partner, the entity is a variable interest entity (VIE) and, as the Company has been determined to be the primary beneficiary, is subject to consolidation. The Company has consolidated this joint venture within its consolidated financial statements since inception. The liabilities of the VIE are not material and none of the VIE assets are encumbered by any obligation of the VIE or other entity.