Business Acquisitions and Investments - Schedule of Valuation of Intangible Assets Acquired and Related Amortization Periods (Detail) - Flight Systems Automotive Group LLC [Member] $ in Thousands	Aug. 31, 2018 USD ($)
Business Acquisition [Line Items]
Valuation,Intangible assets	$ 5,310
Customer Relationships [Member]
Business Acquisition [Line Items]
Valuation,Intangible assets	$ 3,080
Amortization Period (in years)	8 years
Tradenames [Member]
Business Acquisition [Line Items]
Valuation,Intangible assets	$ 1,990
Amortization Period (in years)	15 years
Other [Member]
Business Acquisition [Line Items]
Valuation,Intangible assets	$ 240
Amortization Period (in years)	5 years