Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
Apr. 04, 2015 Segment	Dec. 31, 2014	Mar. 29, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Number of reportable segments	2us-gaap_NumberOfReportableSegments
Cash equivalent maturity period	3 months
Debt issuance costs	$ 5,600,000us-gaap_UnamortizedDebtIssuanceExpense
Total long-term debt	$ 280,019,000	$ 290,026,000	$ 325,171,000	$ 290,026,000

Cash Equivalent Maturity Period, Maximum

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- Details

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

+ Details

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

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