Significant Accounting Policy Updates - Additional Information (Detail) - ASU 2014-09 [Member] - Energy Solutions and Industrial Solutions Segments [Member]	9 Months Ended
	Sep. 30, 2018 Obligation
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue performance obligation, description of timing	The typical life of our contracts is generally less than 12 months and each contract generally contains only one performance obligation, to provide goods or services to the customer.
Number of performance obligation	1
Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contracts life	12 months