Income per Share - Basis for Income per Share Computations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Income from continuing operations	$ 15	$ 29,492	$ 25,171	$ 51,737
Loss from discontinued operations, net of tax			(562)
Net income	$ 15	$ 29,492	$ 24,609	$ 51,737
Weighted average shares outstanding, basic	43,603	43,928	43,559	44,173
Effect of dilutive common stock equivalents	689	862	734	934
Weighted average shares outstanding, diluted	44,292	44,790	44,293	45,107

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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