Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 82,554,000	$ 82,554,000	$ 157,569,000
Goodwill impairment	57,200,000	57,243,000	0	$ 0
Intangible asset impairment	32,900,000	32,937,000	0	0
Amortization expense of intangible asset		$ 10,000,000	10,400,000	$ 10,900,000
Minimum
Goodwill And Intangible Assets [Line Items]
Acquired intangible assets amortization period		3 years
Maximum
Goodwill And Intangible Assets [Line Items]
Acquired intangible assets amortization period		18 years
SS
Goodwill And Intangible Assets [Line Items]
Goodwill	0	$ 0	57,243,000
Goodwill impairment	$ 57,241,000	57,243,000
ES
Goodwill And Intangible Assets [Line Items]
Goodwill			92,000,000
Percentage exceeded from carrying value	42.00%
Miltec
Goodwill And Intangible Assets [Line Items]
Goodwill			8,400,000
Percentage exceeded from carrying value	18.00%
Trade names
Goodwill And Intangible Assets [Line Items]
Indefinite-lived intangible asset	$ 0	$ 0	$ 32,900,000
Intangible asset impairment	$ 32,900,000