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Borrowings (Schedule of Borrowings) (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Total borrowings | $ 955,869 | $ 1,020,873
Less current portion | 323 | 1,046
Less deferred debt issuance costs | 4,133 | 4,399
Less unaccreted debt discount | 1,130 | 1,193
Total long-term borrowings | 950,283 | 1,014,235
Revolving Facility |  |
Debt Instrument [Line Items] |  |
Revolving Facility | 105,342 | 169,579
Senior Notes | 4.5% Senior Notes, due December 2020 |  |
Debt Instrument [Line Items] |  |
Total borrowings | 300,000 | 300,000
Senior Notes | 4.2% Senior Notes, due December 2021 |  |
Debt Instrument [Line Items] |  |
Total borrowings | 350,000 | 350,000
Senior Notes | 3.2% Senior Notes, due June 2023 |  |
Debt Instrument [Line Items] |  |
Total borrowings | 100,000 | 100,000
Senior Notes | 3.37% Senior Notes, due June 2025 |  |
Debt Instrument [Line Items] |  |
Total borrowings | 100,000 | 100,000
Other borrowings |  |
Debt Instrument [Line Items] |  |
Other borrowings | $ 527 | $ 1,294

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