Impact to Previously Reported Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Organization And Basis Of Presentation
Net cash provided by operating activities	$ 33,037	$ 113,850
Effect of exchange rate changes in cash and cash equivalents	(2,882)	(827)
Net impact	5,191	(152,439)
As Previously Reported
Organization And Basis Of Presentation
Changes in operating assets and liabilities, net of effects of acquisitions		66,332
Net cash provided by operating activities		113,966
Effect of exchange rate changes in cash and cash equivalents		(943)
Net impact
As Adjusted
Organization And Basis Of Presentation
Unrealized foreign currency gains, net		(3,229)
Changes in operating assets and liabilities, net of effects of acquisitions		69,445
Net cash provided by operating activities		113,850	[1]
Effect of exchange rate changes in cash and cash equivalents		(827)
Net impact
Impact
Organization And Basis Of Presentation
Unrealized foreign currency gains, net		(3,229)
Changes in operating assets and liabilities, net of effects of acquisitions		3,113
Net cash provided by operating activities		(116)
Effect of exchange rate changes in cash and cash equivalents		116
Net impact

[1] Refer to the above section "Impact of Change in Consolidated Statement of Cash Flows Presentation to Prior Periods"