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Financial instruments - additional information (Detail) (USD $)
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3 Months Ended |
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Mar. 29, 2015
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Mar. 30, 2014
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Dec. 31, 2014
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| Derivatives Fair Value [Line Items] |
|
|
|
| Total notional amount for all open foreign currency forward contracts |
$ 99,600,000 |
|
$ 0 |
| Amount of gains in accumulated other comprehensive income to be reclassified as expense to the statement of income |
100,000 |
|
|
| Allowance for doubtful accounts |
8,300,000 |
|
8,800,000 |
| Current portion of allowance for doubtful accounts |
2,300,000 |
|
2,400,000 |
| Noncurrent portion of allowance for doubtful accounts |
6,000,000 |
|
6,400,000 |
| Net revenues |
429,430,000 |
438,546,000 |
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| Spain, Italy, Portugal, and Greece |
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|
|
| Derivatives Fair Value [Line Items] |
|
|
|
| Current portion of allowance for doubtful accounts |
7,100,000 |
|
8,100,000 |
| Net revenues |
$ 33,000,000 |
$ 39,300,000 |
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