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Long-Term Debt and Short-Term Borrowings - Schedule of Long-Term Debt and Short-Term Borrowings (Parenthetical) (Detail) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Aug. 13, 2015 | Dec. 31, 2014 | Dec. 12, 2014 | Sep. 26, 2014
Senior secured term loans [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date of debt, start | Dec. 31, 2016 | Dec. 31, 2016 |  |  |  |
Maturity date of debt, end | Dec. 31, 2022 | Dec. 31, 2022 |  |  |  |
Minimum [Member] | Senior secured term loans [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of long-term debt | 1.39% | 1.39% |  |  |  |
Maximum [Member] | Senior secured term loans [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of long-term debt | 2.22% | 2.22% |  |  |  |
5.00% Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of long-term debt | 5.00% | 5.00% |  |  |  |
5.00% Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of long-term debt | 5.00% | 5.00% |  |  |  |
Due date of long term debt | 2023 | 2023 |  |  |  |
4.875% Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of long-term debt | 4.875% | 4.875% | 4.875% |  |  |
Debt instrument, maturity date | Mar. 01, 2026 |  |  |  |  |
4.875% Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of long-term debt | 4.875% | 4.875% | 4.875% |  |  |
Due date of long term debt | 2026 | 2026 |  |  |  |
Debt instrument, maturity date | Mar. 01, 2026 |  |  |  |  |
5.25% Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of long-term debt | 5.25% | 5.25% |  | 5.25% | 5.25% | 5.25%
Debt instrument, maturity date | Mar. 15, 2025 |  |  |  |  |
5.25% Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate of long-term debt | 5.25% | 5.25% |  |  |  |
Due date of long term debt | 2025 | 2025 |  |  |  |
Interest at daily one- month LIBOR plus 1.60% [Member] | Warehouse Agreement Borrowings [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, maturity date | May 25, 2017 |  |  |  |  |
Line of credit over LIBOR rate | 1.60% | 1.60% |  |  |  |
Interest at daily one-month LIBOR plus 1.35% with LIBOR floor of 0.35% [Member] | Warehouse Agreement Borrowings [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit over LIBOR rate | 1.35% | 1.35% |  |  |  |
Line of credit, LIBOR floor rate | 0.35% | 0.35% |  |  |  |
Interest at daily one-month LIBOR plus 1.45% [Member] | Warehouse Agreement Borrowings [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, maturity date | Oct. 23, 2017 |  |  |  |  |
Line of credit over LIBOR rate | 1.45% | 1.45% |  |  |  |
Interest at daily one-month LIBOR plus 1.45% to 1.55% [Member] | Warehouse Agreement Borrowings [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, maturity date | Jul. 27, 2017 |  |  |  |  |
Interest at daily one-month LIBOR plus 1.45% to 1.55% [Member] | Minimum [Member] | Warehouse Agreement Borrowings [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit over LIBOR rate | 1.45% | 1.45% |  |  |  |
Interest at daily one-month LIBOR plus 1.45% to 1.55% [Member] | Maximum [Member] | Warehouse Agreement Borrowings [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit over LIBOR rate | 1.55% | 1.55% |  |  |  |
Interest at daily one-month LIBOR plus 1.35% [Member] | Warehouse Agreement Borrowings [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, maturity date | Jun. 30, 2017 |  |  |  |  |
Line of credit over LIBOR rate | 1.35% | 1.35% |  |  |  |
Interest at daily one- month LIBOR plus 2.75% [Member] | Warehouse Agreement Borrowings [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, maturity date | Oct. 23, 2017 |  |  |  |  |
Line of credit over LIBOR rate | 2.75% | 2.75% |  |  |  |

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