Goodwill and Other Intangible Assets - Future Amortization Expense of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017	$ 8,834
2018	8,664
2019	8,517
2020	8,373
2021	8,175
Thereafter	59,010
Net Carrying Amount	101,573	$ 110,621
Structural Systems
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017	907
2018	737
2019	591
2020	490
2021	381
Thereafter	639
Net Carrying Amount	3,745	4,867
Electronic Systems
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017	7,927
2018	7,927
2019	7,926
2020	7,883
2021	7,794
Thereafter	58,371
Net Carrying Amount	$ 97,828	$ 105,754