Organization and Significant Accounting Policies - Assets or Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 23, 2016	Dec. 25, 2015
Money Market Fund Deposits [Member]
Other liabilities:
Assets or liabilities measured at fair value		$ 640
Cash and cash equivalents:
Assets or liabilities measured at fair value		640
Interest Rate Swap [Member]
Other liabilities:
Assets or liabilities measured at fair value	$ 56	23
Cash and cash equivalents:
Assets or liabilities measured at fair value	56	23
Contingent Earn-out Liability [Member]
Other liabilities:
Assets or liabilities measured at fair value	2,236	831
Cash and cash equivalents:
Assets or liabilities measured at fair value	2,236	831
Level 1 [Member] | Money Market Fund Deposits [Member]
Other liabilities:
Assets or liabilities measured at fair value		640
Cash and cash equivalents:
Assets or liabilities measured at fair value		640
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]
Other liabilities:
Assets or liabilities measured at fair value	56	23
Cash and cash equivalents:
Assets or liabilities measured at fair value	56	23
Significant Unobservable Inputs (Level 3) [Member] | Contingent Earn-out Liability [Member]
Other liabilities:
Assets or liabilities measured at fair value	2,236	831
Cash and cash equivalents:
Assets or liabilities measured at fair value	$ 2,236	$ 831