Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jun. 28, 2014	Jun. 29, 2013	Sep. 27, 2014	Sep. 28, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax expense (benefit)
Federal													$ 5,258	$ (3,806)	$ 2,023
State													244	432	(295)
Current Income Tax Expense (Benefit), Total													5,502	(3,374)	1,728
Deferred tax expense (benefit)
Federal													1,186	1,173	5,516
State													(315)	208	(743)
Deferred Income Tax Expense (Benefit), Total													871	1,381	4,773
Income tax expense (benefit)	$ (1,122)	$ 1,754	$ 3,197	$ 2,544	$ (2,115)	$ (1,000)	$ 2,193	$ (1,071)	$ 5,741	$ 1,122	$ 7,495	$ 122	$ 6,373	$ (1,993)	$ 6,501