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Consolidated Quarterly Financial Data (unaudited) - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Schedule of Quarterly Financial Information [Line Items]
Business acquisition, cost of acquired entity, transaction costs		$ 500,000		$ 100,000	$ 200,000	$ 600,000	$ 2,400,000	$ 13,600,000	$ 1,700,000
Reversal of income tax valuation allowance against net deferred tax assets	$ 0	$ 59,887,000	$ 0

X

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

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X

- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318

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- Details

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