Summary of Organization and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 27, 2014

Accounting Policies [Abstract]

Estimated Useful Lives of Assets

The estimated useful lives are generally as follows:

Buildings and improvements	7—40 years
Plant, machinery and equipment	20—40 years
Mobile equipment and barges	15—20 years
Office equipment	3—6 years
Truck and auto fleet	5—10 years
Landfill airspace and improvements	5—60 years
Other	2—10 years

Intangible Assets by Type and in Total

The following table shows intangible assets by type and in total:

	December 27, 2014							December 28, 2013
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Leases	$	10,357	$	(2,031	)	$	8,326	$	10,430	$	(1,604	)	$	8,826
Reserve rights		9,094		(540	)		8,554		5,890		(221	)		5,669
Trade names		1,020		(470	)		550		1,020		(368	)		652
Other		249		(32	)		217		—		—			—
Total intangible assets	$	20,720	$	(3,073	)	$	17,647	$	17,340	$	(2,193	)	$	15,147

Estimated Amortization Expense for Intangible Assets

The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows:

2015	$	3,105
2016		1,675
2017		956
2018		956
2019		956
Thereafter		9,999
Total	$	17,647

Assets and Liabilities Measured at Fair Value

Assets and liabilities measured at fair value in the consolidated balance sheets as of December 27, 2014 and December 28, 2013 are as follows:

	2014		2013
Accrued expenses:
Current portion of contingent consideration	$	2,375	$	—
Acquisition- related liabilities
Contingent consideration	$	5,379	$	1,908