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Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Cash paid during period:
Income taxes			$ 8,522	$ 11,808
Non-cash investing and financing activities:
Unrealized gain on short-term investments	$ (32)	$ (1)	4	84
Vested stock unit awards issued to settle accrued bonuses			6,910	6,334
Accrual for capital expenditures			$ 135	$ 422

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Vested Restricted Stock Awards Issued to Settle Accrued Bonuses

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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-SubTopic 10
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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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-Publisher FASB
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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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