Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 18, 2017	Jun. 19, 2016	Jun. 18, 2017	Jun. 19, 2016
Earnings Per Share [Abstract]
Net income available to common stockholders - basic and diluted	$ 65,741	$ 49,261	$ 128,210	$ 94,712
Basic weighted average number of shares	47,972,526	49,213,330	47,906,187	49,455,412
Earnings per share - basic	$ 1.37	$ 1.00	$ 2.68	$ 1.92
Diluted weighted average number of shares	49,776,821	50,459,754	49,741,794	50,846,941
Earnings per share - diluted	$ 1.32	$ 0.98	$ 2.58	$ 1.86

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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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 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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