Preliminary Allocation of Purchase Price to Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2015	Dec. 31, 2014
Intangible assets
Goodwill	$ 26,600	$ 19,205
ARAS
Tangible assets acquired:
Accounts receivable	269
Other assets	9
Total assets acquired	278
Liabilities assumed:
Accounts payable and accrued liabilities	41
Other liabilities	210
Total liabilities assumed	251
Intangible assets
Intangible assets	5,351
Net assets acquired	5,378
Deferred tax liability	1,385
Purchase price, net of cash acquired	7,640
Contingent consideration	1,348
Goodwill	4,995
ARAS | Trade Names
Intangible assets
Intangible assets	509
ARAS | Noncompete Agreements
Intangible assets
Intangible assets	540
ARAS | Technology-Based Intangible Assets
Intangible assets
Intangible assets	2,052
ARAS | Customer Relationships
Intangible assets
Intangible assets	2,250
Kubit GmbH
Tangible assets acquired:
Accounts receivable	250
Other assets	246
Total assets acquired	496
Liabilities assumed:
Accounts payable and accrued liabilities	315
Other liabilities	353
Total liabilities assumed	668
Intangible assets
Intangible assets	2,590
Net assets acquired	2,418
Deferred tax liability	669
Purchase price, net of cash acquired	4,426
Contingent consideration	987
Goodwill	3,664
Kubit GmbH | Trade Names
Intangible assets
Intangible assets	658
Kubit GmbH | Noncompete Agreements
Intangible assets
Intangible assets	272
Kubit GmbH | Technology-Based Intangible Assets
Intangible assets
Intangible assets	945
Kubit GmbH | Customer Relationships
Intangible assets
Intangible assets	$ 715