Acquisitions - Net Purchase Price and Preliminary Allocation for Acquisition (Detail) (Micronetics, USD $) In Thousands, unless otherwise specified	Aug. 08, 2012
Micronetics
Consideration transferred
Cash paid to shareholders and to settle vested options	$ 69,830
Value allocated to unvested options	513
Less cash acquired	(2,109)
Net purchase price	68,234
Estimated fair value of tangible assets acquired and liabilities assumed
Cash	2,109
Accounts receivable	3,635
Inventory	12,080
Fixed assets	5,712
Current and non-current deferred tax assets	2,764
Other current and non-current assets	1,721
Accounts payable and accrued expenses	(6,090)
Long-term debt	(6,575)
Deferred tax liabilities	(8,114)
Estimated fair value of net tangible assets acquired	7,242
Estimated fair value of identifiable intangible assets	18,500
Estimated fair value of goodwill	44,601
Estimated fair value of assets acquired	70,343
Less cash acquired	(2,109)
Net purchase price	$ 68,234