Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 423,581	$ 369,504	$ 283,256
Net cash used in investing activities	(196,887)	(125,512)	(79,920)
Net cash used in financing activities	(230,220)	(228,970)	(196,271)
Net (decrease) increase in cash and cash equivalents	(3,526)	15,022	7,065
CASH AND CASH EQUIVALENTS, beginning of year	77,919	62,897	55,832
CASH AND CASH EQUIVALENTS, end of year	74,393	77,919	62,897
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	296,087	211,247	260,602
Net cash used in investing activities	(73,404)	(83,895)	(42,378)
Net cash used in financing activities	(241,993)	(95,705)	(218,224)
Net (decrease) increase in cash and cash equivalents	(19,310)	31,647
CASH AND CASH EQUIVALENTS, beginning of year	31,647
CASH AND CASH EQUIVALENTS, end of year	12,337	31,647
Combined Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	127,494	158,257	22,654
Net cash used in investing activities	(102,337)	(56,617)	(37,542)
Net cash used in financing activities	(9,373)	(118,265)	21,953
Net (decrease) increase in cash and cash equivalents	15,784	(16,625)	7,065
CASH AND CASH EQUIVALENTS, beginning of year	46,272	62,897	55,832
CASH AND CASH EQUIVALENTS, end of year	62,056	46,272	62,897
Consolidating Adjustments and Other
Condensed Financial Statements, Captions [Line Items]
Net cash used in investing activities	(21,146)	15,000
Net cash used in financing activities	$ 21,146	$ (15,000)

- Definition

For the entity and the disposal group, cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.

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