Organization and Significant Accounting Policies - Assets or Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 30, 2016	Dec. 25, 2015
Money Market Fund Deposits [Member]
Other assets:
Assets measured at fair value		$ 640
Cash and cash equivalents:
Assets measured at fair value		640
Interest Rate Swap [Member]
Other assets:
Assets measured at fair value	$ 15
Other liabilities:
Liabilities measured at fair value	6	23
Cash and cash equivalents:
Assets measured at fair value	15
Contingent Earn-out Liability [Member]
Other liabilities:
Liabilities measured at fair value	278	831
Level 1 [Member] | Money Market Fund Deposits [Member]
Other assets:
Assets measured at fair value		640
Cash and cash equivalents:
Assets measured at fair value		640
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]
Other assets:
Assets measured at fair value	15
Other liabilities:
Liabilities measured at fair value	6	23
Cash and cash equivalents:
Assets measured at fair value	15
Significant Unobservable Inputs (Level 3) [Member] | Contingent Earn-out Liability [Member]
Other liabilities:
Liabilities measured at fair value	$ 278	$ 831