Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 66,582	$ 96,855
Net cash used in investing activities	(26,726)	(11,655)
Net cash provided by (used in) financing activities	(65,094)	(87,767)
Net decrease in cash and cash equivalents	(25,238)	(2,567)
CASH AND CASH EQUIVALENTS, beginning of period	77,919	62,897
CASH AND CASH EQUIVALENTS, end of period	52,681	60,330
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	86,628	(123,998)
Net cash used in investing activities	(24,008)	(8,149)
Net cash provided by (used in) financing activities	(66,062)	159,905
Net decrease in cash and cash equivalents	(3,442)	27,758
CASH AND CASH EQUIVALENTS, beginning of period	31,647
CASH AND CASH EQUIVALENTS, end of period	28,205	27,758
Combined Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(20,046)	220,853
Net cash used in investing activities	(2,718)	(3,506)
Net cash provided by (used in) financing activities	968	(247,672)
Net decrease in cash and cash equivalents	(21,796)	(30,325)
CASH AND CASH EQUIVALENTS, beginning of period	46,272	62,897
CASH AND CASH EQUIVALENTS, end of period	$ 24,476	$ 32,572