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Operating Segment Information (Detail) - (Table 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting [Abstract]
Domestic	$ 264,817	$ 267,658	$ 517,254	$ 519,303
International	32,817	21,034	59,296	35,359
Total	$ 297,634	$ 288,692	$ 576,550	$ 554,662

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Revenues from external customers attributed to the entity's country of domicile.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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