Goodwill and Other Intangible Assets - Carrying Amount of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 161,445	$ 170,145
Accumulated Amortization	50,824	47,978
Net Carrying Amount	$ 110,621	122,167
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	18 years
Gross Carrying Amount	$ 159,200	164,500
Accumulated Amortization	49,463	43,715
Net Carrying Amount	$ 109,737	120,785
Contract renewal
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	14 years
Gross Carrying Amount	$ 1,845	1,845
Accumulated Amortization	1,230	1,099
Net Carrying Amount	$ 615	746
Technology
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	15 years
Gross Carrying Amount	$ 400	400
Accumulated Amortization	131	104
Net Carrying Amount	$ 269	296
Trade Names
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	8 years
Gross Carrying Amount	$ 0	3,400
Accumulated Amortization	0	3,060
Net Carrying Amount	0	340
Structural Systems
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,300	19,300
Accumulated Amortization	14,433	13,046
Net Carrying Amount	4,867	6,254
Electronic Systems
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	142,145	150,845
Accumulated Amortization	36,391	34,932
Net Carrying Amount	$ 105,754	$ 115,913