Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 133,906	$ 182,859
Net cash used in investing activities	(41,907)	(28,738)
Net cash provided by (used in) financing activities	(123,303)	(179,143)
Net increase (decrease) in cash and cash equivalents	(31,304)	(25,022)
CASH AND CASH EQUIVALENTS, beginning of period	77,919	62,897
CASH AND CASH EQUIVALENTS, end of period	46,615	37,875
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	147,625	(57,630)
Net cash used in investing activities	(36,097)	(21,146)
Net cash provided by (used in) financing activities	(127,882)	87,747
Net increase (decrease) in cash and cash equivalents	(16,354)	8,971
CASH AND CASH EQUIVALENTS, beginning of period	31,647
CASH AND CASH EQUIVALENTS, end of period	15,293	8,971
Combined Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(13,719)	240,489
Net cash used in investing activities	(5,810)	(7,592)
Net cash provided by (used in) financing activities	4,579	(266,890)
Net increase (decrease) in cash and cash equivalents	(14,950)	(33,993)
CASH AND CASH EQUIVALENTS, beginning of period	46,272	62,897
CASH AND CASH EQUIVALENTS, end of period	$ 31,322	$ 28,904