Purchase Price Allocation (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Mar. 31, 2011 Year	Mar. 18, 2011
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Cash		$ 2,375
Accounts Receivable		2,030
Other current assets		958
Total current assets acquired		5,363
Noncurrent assets:
Property and equipment		519
Goodwill		11,380
Total assets acquired		23,906
Current liabilities acquired		(4,681)
Net assets acquired		19,225
Intellectual property rights
Noncurrent assets:
Amortizable intangible assets		2,338
Acquired intangible assets, weighted-average useful lives (in years)	5
Customer relationships
Noncurrent assets:
Amortizable intangible assets		4,059
Acquired intangible assets, weighted-average useful lives (in years)	9
Trade Name
Noncurrent assets:
Amortizable intangible assets		$ 247
Acquired intangible assets, weighted-average useful lives (in years)	5