Estimated Acquisition Date Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Aug. 20, 2012
Business Acquisition [Line Items]
Cash and cash equivalents	$ 1,859
Receivables	11,831
Prepaid expenses	617
Total current assets	14,307
Property and equipment	11,326
Goodwill	80,766
Intangibles	57,720
Deferred charges and other assets	916
Accounts payable	(880)
Accrued employee compensation and benefits	(3,774)
Income taxes payable	(141)
Deferred revenue	(94)
Other accrued expenses and current liabilities	(601)
Total current liabilities	(5,490)
Other long-term liabilities	(10,592)	[1]
Purchase price, total	$ 148,953

[1] Primarily includes long-term deferred tax liabilities.