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Fair Value Measurements - Financial Assets and Liabilities Carried at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 27, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | $ 481,706 | $ 352,968
Total assets at fair value | 497,026 | 357,795
Total liabilities at fair value | 9,170 | 7,570
U.S. Government and Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 182,470 | 89,626
Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets at fair value | 9,622 |
Total liabilities at fair value |  | 2,743
Forward Interest Rate Swap Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities at fair value | 3,472 |
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 182,470 | 89,626
Total assets at fair value | 191,584 | 94,453
Total liabilities at fair value | 5,698 | 5,992
Level 1 [Member] | U.S. Government and Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 182,470 | 89,626
Level 1 [Member] | Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets at fair value | 3,416 |
Total liabilities at fair value |  | 1,165
Level 1 [Member] | Forward Interest Rate Swap Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities at fair value | 0 |
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 296,836 | 260,754
Total assets at fair value | 303,042 | 260,754
Total liabilities at fair value | 3,472 | 1,578
Level 2 [Member] | U.S. Government and Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 0 | 0
Level 2 [Member] | Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets at fair value | 6,206 |
Total liabilities at fair value |  | 1,578
Level 2 [Member] | Forward Interest Rate Swap Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities at fair value | 3,472 |
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 2,400 | 2,588
Total assets at fair value | 2,400 | 2,588
Total liabilities at fair value | 0 | 0
Level 3 [Member] | U.S. Government and Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 0 | 0
Level 3 [Member] | Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets at fair value | 0 |
Total liabilities at fair value |  | 0
Level 3 [Member] | Forward Interest Rate Swap Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities at fair value | 0 |
Other Investments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 23,765 | 11,785
Other Investments [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 0 | 0
Other Investments [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 23,765 | 11,785
Other Investments [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 0 | 0
Obligations of Government-Sponsored Enterprises [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 40,631 | 33,510
Obligations of Government-Sponsored Enterprises [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 0 | 0
Obligations of Government-Sponsored Enterprises [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 40,631 | 33,510
Obligations of Government-Sponsored Enterprises [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 0 | 0
State and Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 49,022 | 51,627
State and Municipal Bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 0 | 0
State and Municipal Bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 49,022 | 51,627
State and Municipal Bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 0 | 0
Corporate Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 185,818 | 166,420
Corporate Securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 0 | 0
Corporate Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 183,418 | 163,832
Corporate Securities [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments subtotal | 2,400 | 2,588
Money Market Investments Related to the Deferred Compensation Plan [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets at fair value | 5,698 | 4,827
Money Market Investments Related to the Deferred Compensation Plan [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets at fair value | 5,698 | 4,827
Money Market Investments Related to the Deferred Compensation Plan [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets at fair value | 0 | 0
Money Market Investments Related to the Deferred Compensation Plan [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets at fair value | 0 | 0
Liabilities Related to the Deferred Compensation Plan [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities at fair value | 5,698 | 4,827
Liabilities Related to the Deferred Compensation Plan [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities at fair value | 5,698 | 4,827
Liabilities Related to the Deferred Compensation Plan [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities at fair value | 0 | 0
Liabilities Related to the Deferred Compensation Plan [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities at fair value | $ 0 | $ 0

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