Income per Share - Basis for Income per Share Computations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ (19,636)	$ 25,156
Loss from disposal of discontinued operations, net of tax		(562)
Net income (loss)	$ (19,636)us-gaap_NetIncomeLoss	$ 24,594us-gaap_NetIncomeLoss
Weighted average shares outstanding, basic	42,535	43,514
Effect of dilutive common stock equivalents		779
Weighted average shares outstanding, diluted	42,535	44,293

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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