Employee Long Term Incentive Plan - Additional Information (Detail) - USD ($)
|
12 Months Ended |
Dec. 27, 2014 |
Dec. 28, 2013 |
Dec. 29, 2012 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| The estimated fair value |
$ 1,500,000
|
|
|
| Dividend yield |
0.00%
|
|
|
| Share-based compensation expense |
$ 2,200,000
|
$ 2,300,000
|
$ 2,500,000
|
| Unrecognized compensation cost |
$ 3,100,000
|
|
|
| Weighted average remaining contractual term |
1 year 8 months 12 days
|
|
|
| Class D Units [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Cumulative amount of units vested |
$ 3,321
|
$ 2,531
|
|
| Dividend yield |
|
|
0.00%
|
| Class D Units [Member] | Time-Vesting Interests [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Units vesting on first anniversary |
20.00%
|
|
|
| Units vesting monthly following the first anniversary |
80.00%
|
|
|
| Number of years required for remaining units to be vested under vesting condition |
4 years
|
|
|
| Period for non vested units for automatic forfeiture without consideration |
8 years
|
|
|
| Fair value of time-vesting units |
$ 600,000
|
$ 1,600,000
|
$ 1,100,000
|
| Weighted-average grant-date fair value |
$ 1,368
|
$ 2,786
|
$ 3,761
|