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Borrowings (Schedule of Borrowings) (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Total borrowings | $ 1,101,889 | $ 847,436
Less current portion | 1,333 | 1,087
Less deferred debt issuance costs | 4,945 | 5,203
Less unaccreted debt discount | 1,379 | 1,439
Total long-term borrowings | 1,094,232 | 839,707
4.5% Senior Notes, due December 2020 |  |
Debt Instrument [Line Items] |  |
Total borrowings | 300,000 | 300,000
4.2% Senior Notes, due December 2021 |  |
Debt Instrument [Line Items] |  |
Total borrowings | 350,000 | 350,000
Revolving Facility |  |
Debt Instrument [Line Items] |  |
Revolving Facility | 450,000 | 195,000
Other borrowings |  |
Debt Instrument [Line Items] |  |
Other borrowings | $ 1,889 | $ 2,436

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