Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 283,256	$ 351,076	$ 255,515
Net cash used in investing activities	(79,920)	(172,039)	(144,223)
Net cash used in financing activities	(196,271)	(148,714)	(131,691)
Net Increase in Cash and Cash Equivalents	7,065	30,323	(20,399)
CASH AND CASH EQUIVALENTS, beginning of year	55,832	25,509	45,908
CASH AND CASH EQUIVALENTS, end of year	62,897	55,832	25,509
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	260,602
Net cash used in investing activities	(42,378)
Net cash used in financing activities	(218,224)
Combined Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	22,654
Net cash used in investing activities	(37,542)
Net cash used in financing activities	21,953
Net Increase in Cash and Cash Equivalents	7,065
CASH AND CASH EQUIVALENTS, beginning of year	55,832
CASH AND CASH EQUIVALENTS, end of year	$ 62,897

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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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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