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Borrowings - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 20, 2017 USD ($) | Jan. 05, 2017 USD ($) shares | Apr. 02, 2017 USD ($) | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Nov. 20, 2017 USD ($) | Oct. 01, 2017 USD ($) | May 16, 2016 USD ($) | May 21, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.875% | 3.875% | 3.875% |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 5,593,000 | $ 19,261,000 | $ 10,454,000 |  |  |  |
Reduction in borrowings |  |  |  | $ 1,239,576,000 | $ 714,565,000 | $ 303,757,000 |  |  |  |
Stock redeemed or called during period (in shares) | shares |  |  |  | 120,000 |  |  |  |  |  |
Conversion of convertible notes, shares issued upon conversion | shares |  |  |  | 500,000 | 1,700,000 | 2,700,000 |  |  |  |
Ownership percentage of subsidiaries |  |  |  | 50.00% |  |  |  |  |  |
Total long-term debt |  |  |  | $ 2,249,552,000 | $ 1,033,323,000 |  |  |  |  |
Conversion | Convertible Debt | Convertible Notes Payable |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stock redeemed or called during period (in shares) | shares |  |  |  | 500,000 |  |  |  |  |  |
Short-term debt |  |  |  | $ 44,300,000 |  |  |  |  |  |
Convertible notes payable |  |  |  | $ 44,200,000 |  |  |  |  |  |
Conversion of convertible notes, shares issued upon conversion | shares |  |  |  | 500,000 |  |  |  |  |  |
Warrant shares exercised (in shares) | shares |  |  |  | 165,034 |  |  |  |  |  |
Warrants delivered to the counter-party (in shares) | shares |  |  |  | 105,638 |  |  |  |  |  |
Shares withheld to cover payment of the exercise price (in shares) | shares |  |  |  | 43,251 |  |  |  |  |  |
Warrants, outstanding (in shares) | shares |  |  |  | 559,614 |  |  |  |  |  |
Exercise price of warrants or rights (in shares) | $ / shares |  |  |  | $ 74.65 |  |  |  |  |  |
Warrants and rights outstanding |  |  |  | $ 98,000,000 |  |  |  |  |  |
Standby Letters of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility amount outstanding |  |  |  | $ 3,200,000 | $ 3,200,000 |  |  |  |  |
Securitization Program |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.31% | 1.52% |  |  |  |  |
Maximum amount available under receivable securitization |  |  |  | $ 50,000,000 |  |  |  |  |  |
Securitization program, at a rate of 2.31% at December 31, 2017 and 1.52% at December 31, 2016 |  |  |  | 50,000,000 | $ 50,000,000 |  |  |  |  |
2017 Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 2.00% |  |  |  |  |  |  |  |  |
Leverage ratio, required | 4.50 |  |  |  |  |  |  |  |  |
Maximum secured leverage ratio | 3.50 |  |  |  |  |  |  |  |  |
Interest coverage ratio, required | 3.50 |  |  |  |  |  |  |  |  |
Debt issuance, line of credit |  |  |  | $ 11,800,000 |  |  |  |  |  |
2017 Credit Agreement | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |  |  |
2017 Credit Agreement | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.50% |  |  |  |  |  |  |  |  |
2017 Credit Agreement | Federal Funds |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |  |  |
2017 Credit Agreement | Adjusted LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |  |  |
2017 Credit Agreement | Adjusted LIBOR | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.25% |  |  |  |  |  |  |  |  |
2017 Credit Agreement | Adjusted LIBOR | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |  |  |  |
2017 Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt, term | 5 years |  |  |  |  |  |  |  |  |
Maximum amount available for borrowing | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |
Debt issuance, line of credit |  |  |  |  |  |  |  | $ 6,800,000 |  |
2017 Credit Agreement | Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum amount available for borrowing | $ 750,000,000.0 |  |  |  |  |  |  |  |  |
5.25% Senior Notes due 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% |  |  |  |  |  |
Interest rate |  |  |  | 5.25% | 5.25% |  |  |  |  | 5.25%
Senior notes |  |  |  | $ 250,000,000 | $ 250,000,000 |  |  |  |  | $ 250,000,000
Ownership percentage of subsidiaries |  |  |  | 100.00% |  |  |  |  |  |
Senior credit facility interest rate |  |  |  |  | 3.57% |  |  |  |  |
5.25% Senior Notes due 2024 | Senior Notes | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Declining percent of redemption price to principal amount |  |  |  | 0.875% |  |  |  |  |  |
5.25% Senior Notes due 2024 | Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of redemption price to principal amount |  |  |  | 102.625% |  |  |  |  |  |
Declining percent of redemption price to principal amount |  |  |  | 100.00% |  |  |  |  |  |
5.25% Senior Notes due 2024 | Senior Notes | Debt Instrument Redemption Prior To June 15, 2019 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of redemption price to principal amount on redemption |  |  |  | 100.00% |  |  |  |  |  |
Make whole premium as percentage of principal amount of notes subject to redemption |  |  |  | 1.00% |  |  |  |  |  |
5.25% Senior Notes due 2024 | Senior Notes | Debt Instrument Redemption Prior To June 15 2017 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of redemption price to principal amount on redemption |  |  |  | 105.25% |  |  |  |  |  |
Percent of principal amount of notes redeemable |  |  |  | 35.00% |  |  |  |  |  |
4.875% Senior Notes due 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance, line of credit |  |  |  | $ 6,500,000 |  |  |  |  |  |
4.875% Senior Notes due 2026 | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Declining percent of redemption price to principal amount |  |  |  | 0.813% |  |  |  |  |  |
4.875% Senior Notes due 2026 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Declining percent of redemption price to principal amount |  |  |  | 100.00% |  |  |  |  |  |
4.875% Senior Notes due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 50.00% |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 4.875% |
Senior notes |  |  |  |  |  |  |  |  | $ 400,000,000 |
4.875% Senior Notes due 2026 | Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of redemption price to principal amount |  |  |  | 102.438% |  |  |  |  |  |
4.625% Senior Notes due 2027 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance, line of credit |  |  |  | $ 7,900,000 |  |  |  |  |  |
4.625% Senior Notes due 2027 | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Declining percent of redemption price to principal amount |  |  |  | 0.771% |  |  |  |  |  |
4.625% Senior Notes due 2027 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Declining percent of redemption price to principal amount |  |  |  | 100.00% |  |  |  |  |  |
4.625% Senior Notes due 2027 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 50.00% |  |  |  |  |  |
Interest rate |  |  |  | 4.625% | 4.625% |  | 4.625% |  |  |
Senior notes |  |  |  | $ 500,000,000 | $ 0 |  | $ 500,000,000 |  |  |
4.625% Senior Notes due 2027 | Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of redemption price to principal amount |  |  |  | 102.313% |  |  |  |  |  |
4.625% Senior Notes due 2027 | Senior Notes | Debt Instrument Redemption Prior To June 1, 2019 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of redemption price to principal amount on redemption |  |  |  | 104.875% |  |  |  |  |  |
Percent of principal amount of notes redeemable |  |  |  | 40.00% |  |  |  |  |  |
4.625% Senior Notes due 2027 | Senior Notes | Debt Instrument Redemption Prior To June 1, 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of redemption price to principal amount on redemption |  |  |  | 100.00% |  |  |  |  |  |
Make whole premium as percentage of principal amount of notes subject to redemption |  |  |  | 1.00% |  |  |  |  |  |
4.625% Senior Notes due 2027 | Senior Notes | Debt Instrument Redemption Prior To November 15, 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of redemption price to principal amount on redemption |  |  |  | 104.625% |  |  |  |  |  |
Percent of principal amount of notes redeemable |  |  |  | 40.00% |  |  |  |  |  |
2013 Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 400,000 |  |  |  |  |  |  |
3.875% Convertible Senior Subordinated Notes due 2017 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.875% | 3.875% |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 5,200,000 |  |  |  |  |  |  |
Extinguishment of debt, amount |  | $ 91,700,000 |  |  |  |  |  |  |  |
Principal amount of convertible notes |  | 1,000 |  |  |  |  |  |  |  |
Reduction in borrowings |  | 93,200,000 |  |  |  |  |  |  |  |
Repayments of accrued debt interest |  | $ 1,500,000 |  |  |  |  |  |  |  |
Treasury stock reissued (in shares) | shares |  | 930,000 |  |  |  |  |  |  |  |

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