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Long-term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			1 Months Ended			1 Months Ended			1 Months Ended			1 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Letter of Credit [Member]	Feb. 03, 2014 Letter of Credit [Member]	Apr. 30, 2010 7 7/8% Senior Subordinated Notes [Member]	Mar. 31, 2014 7 7/8% Senior Subordinated Notes [Member]	Apr. 22, 2010 7 7/8% Senior Subordinated Notes [Member]	Feb. 29, 2012 5 7/8% Senior Subordinated Notes [Member]	Mar. 31, 2014 5 7/8% Senior Subordinated Notes [Member]	Feb. 09, 2012 5 7/8% Senior Subordinated Notes [Member]	Oct. 31, 2012 5% Senior Subordinated Notes [Member]	Mar. 31, 2014 5% Senior Subordinated Notes [Member]	Oct. 30, 2012 5% Senior Subordinated Notes [Member]	Jan. 31, 2014 5 3/8% Senior Notes [Member]	Mar. 31, 2014 5 3/8% Senior Notes [Member]	Jan. 10, 2014 5 3/8% Senior Notes [Member]	Feb. 03, 2014 Incremental Facility [Member]
Debt Instrument [Line Items]
Interest rate on convertible notes					7.875%	7.875%		5.875%	5.875%		5.00%	5.00%		5.375%	5.375%
Aggregate principal amount of debt issued						$ 400,000			$ 500,000	$ 535,000					$ 510,000
Net proceeds from the issuance of debt				392,000			489,000			527,100			502,300
Redemption percentage of aggregate principal amount of senior notes				35.00%			35.00%			35.00%			35.00%
Redemption percentage equal to principal amount include aggregate premium				100.00%			100.00%			100.00%			100.00%
Additional redeemed percentage of aggregate principal amount				107.875%			105.875%			105.00%			105.375%
Redemption percentage of issued notes which remain outstanding				65.00%			65.00%			65.00%			65.00%
Redemption price percentage of the principal amount to be purchased				101.00%			101.00%			101.00%			101.00%
Redemption period													120 days
Maximum borrowing limit of incremental loan facility			400,000													500,000
Outstanding revolving credit facility		0
Letter of credit outstanding		6,973
Remaining borrowing capacity under revolving credit facility	$ 393,027
Revolving credit facility maturity date	Feb. 02, 2019

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Percentage of aggregate principle which may be redeemed at any time at a specified price.

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- Definition

Percentage premium which may be required for repayment if the Company undergoes a change in control.

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Line Of Credit Facilities Maturity Date

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Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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

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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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Amount of letters of credit outstanding under debtor-in-possession financing arrangement.

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Amount borrowed under the credit facility as of the balance sheet date.

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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 of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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