Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Jan. 01, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for contract losses and doubtful accounts	$ (3,805)	$ (2,792)
Total accounts receivable, net	94,292	88,577
Billed accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	63,676	62,360
Unbilled accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 34,421	$ 29,009