Class of Warrant or Right, Delivered To The Counterparty

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- Definition

Debt Instrument, Covenant Terms, Maximum Leverage Ratio

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Debt Instrument, Covenant Terms, Maximum Secured Leverage Ratio

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Debt Instrument, Covenant Terms, Minimum Interest Coverage Ratio

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- Definition

Declining percent of redemption price to principal amount.

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- Definition

Make whole premium as percentage of principal amount of notes subject to redemption.

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- Definition

Maximum Amount Available under Receivable Securitization

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No definition available.

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- Definition

Percent of principal amount of notes redeemable.

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No definition available.

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Percent of redemption price to principal amount.

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- Definition

Principal amount of Convertible Notes.

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No definition available.

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- Definition

Repayments Of Debt Accrued Interest

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No definition available.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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No definition available.

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Number of warrants or rights outstanding.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Gross amount of debt extinguished.

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No definition available.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The effective interest rate during the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Number of stock bought back by the entity at the exercise price or redemption price.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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Borrowings - Additional Information (Detail)			3 Months Ended	12 Months Ended
Borrowings - Additional Information (Detail)	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