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Long-term Debt - Additional Information (Detail) (USD $)	12 Months Ended					0 Months Ended	1 Months Ended	12 Months Ended			1 Months Ended			1 Months Ended			1 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Letter of Credit [Member]	Feb. 09, 2012 Letter of Credit [Member]	Dec. 04, 2013 9 3/4% Senior Notes [Member]	Mar. 31, 2009 9 3/4% Senior Notes [Member]	Dec. 31, 2013 9 3/4% Senior Notes [Member]	Dec. 31, 2012 9 3/4% Senior Notes [Member]	Mar. 27, 2009 9 3/4% Senior Notes [Member]	Apr. 30, 2010 7 7/8% Senior Subordinated Notes [Member]	Dec. 31, 2013 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]	Dec. 31, 2013 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]	Dec. 31, 2013 5% Senior Subordinated Notes [Member]	Oct. 30, 2012 5% Senior Subordinated Notes [Member]	Dec. 31, 2013 Senior Credit Facility [Member]	Feb. 09, 2012 Senior Credit Facility [Member]	Feb. 09, 2012 Term Loan A-1 Facility [Member]	Feb. 09, 2012 Term Loan A-2 Facility [Member]	Feb. 09, 2012 Term Loan A-3 Facility [Member]	Feb. 09, 2012 Term Loan B Facility [Member]	Feb. 09, 2012 Incremental Facility [Member]
Debt Instrument [Line Items]
Interest rate on convertible notes									9.75%	9.75%		7.875%	7.875%		5.875%	5.875%		5.00%	5.00%
Aggregate principal amount of debt issued	$ 1,938,802,000									$ 350,000,000			$ 400,000,000			$ 500,000,000	$ 535,000,000
Gross proceeds from the issuance of debt		1,035,000,000					314,927,000
Net proceeds from the issuance of debt							307,489,000				392,000,000			489,000,000			527,100,000
Description of Interest computation	360-day year comprised of twelve 30-day months
Redemption percentage of aggregate principal amount of senior notes							35.00%				35.00%
Additional redeemed percentage of aggregate principal amount							109.75%				107.875%			105.875%			105.00%
Redemption percentage equal to principal amount include aggregate premium								100.00%						100.00%			100.00%
Redemption price percentage of the principal amount to be purchased								101.00%						101.00%			101.00%
Principal amount of debt extinguished						350,000,000
Loss (gain) on extinguishment of debt	(14,345,000)	(41,632,000)	(677,000)			14,345,000
Non-cash loss on debt extinguishment						3,962,000
Outstanding revolving credit facility				150,000,000				0
Redemption percentage equal to principal amount include aggregate premium											100.00%
Redemption percentage of issued notes which remain outstanding											65.00%
Redemption percentage of aggregate principal amount of senior notes														35.00%			35.00%
Redemption percentage of issued notes which remain outstanding														65.00%			65.00%
Maximum borrowing limit of incremental loan facility	250,000,000				250,000,000																100,000,000	270,000,000	30,000,000	100,000,000	575,000,000	300,000,000
Additional Senior credit facility	200,000,000
Senior debt ratio	3.25
Line of credit facility maximum borrowing capacity available to subsidiaries																										110,000,000
Reduced percentage of consolidated excess cash flow to repay outstanding loan two	0.00%
Ratio of indebtedness to net capital minimum																				1.00
Ratio of indebtedness to net capital one																				5.00
Letter of credit outstanding				6,973,000
Remaining borrowing capacity under revolving credit facility	$ 93,027,000

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