Basis of Reporting for Consolidated Financial Statements - Additional Information (Detail) - Acquisition	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Basis Of Presentation And Principles Of Consolidation [Line Items]
Number of acquisitions	1		4
Peerless Propulsys [Member]
Basis Of Presentation And Principles Of Consolidation [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	60.00%	60.00%
Percentage of ownership by parent in net income loss		80.00%