Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles and Practices (Detail)

v3.7.0.1
Summary of Significant Accounting Principles and Practices (Detail)
 12 Months Ended
Oct. 11, 2016
Jan. 14, 2015
USD ($)
Dec. 31, 2016
USD ($)
segment
contract
reporting_unit
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Oct. 02, 2016
reporting_unit
Business Acquisition            
Number of reportable segments | segment     2      
Revenue and Expense Recognition            
Significant contracts with right of return | contract     0      
Revenue recognized from long term fixed price contracts     $ 20,700,000 $ 17,200,000 $ 2,700,000  
Research and development, design and related engineering     $ 90,200,000 90,100,000 76,700,000  
Class of Stock            
Period of options granted (in years)     5 years      
Cash and cash equivalents maturity period (in months)     3 months      
Property, Plant and Equipment            
Depreciation expense     $ 14,300,000 13,300,000 10,600,000  
Capital leases payments due in 2017     2,600,000      
Capital leases payments due in 2018     2,600,000      
Capital leases payments due in 2019     2,000,000      
Capital leases payments due in 2020     2,100,000      
Capital leases payments due in 2021     $ 2,200,000      
Goodwill and Intangible Assets            
Number of reporting units | reporting_unit     10      
Number of reporting units have goodwill and subject to goodwill impairment test | reporting_unit           8
Goodwill impairment charge     $ 0 0 0  
Intangible asset impairment charge     $ 0 0 $ 0  
Foreign Currency Translation            
Aggregate transaction gain included in operations       1,000,000    
Year 1            
Class of Stock            
Annual vesting percentage     20.00%      
Year 2            
Class of Stock            
Annual vesting percentage     20.00%      
Year 3            
Class of Stock            
Annual vesting percentage     20.00%      
Year 4            
Class of Stock            
Annual vesting percentage     20.00%      
Year 5            
Class of Stock            
Annual vesting percentage     20.00%      
Building            
Property, Plant and Equipment            
Building acquired under capital leases, net     $ 10,500,000 12,300,000    
Building acquired under capital leases, gross     14,300,000 14,800,000    
Accumulated amortization     $ 3,800,000 $ 2,500,000    
Building | Minimum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (in years)     25 years      
Building | Maximum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (in years)     40 years      
Machinery and Equipment | Minimum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (in years)     4 years      
Machinery and Equipment | Maximum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (in years)     10 years      
Convertible Class B Stock            
Class of Stock            
Stock distribution 0.15          
Armstrong Areospace, Inc.            
Business Acquisition            
Effective date of acquisition     Jan. 14, 2015      
Percentage of acquired stock   100.00%        
Cash purchase price   $ 52,300,000