Income Taxes - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
Mar. 31, 2013	Mar. 31, 2013	Mar. 31, 2014 Unrecognized Tax Positions Maximum
Income Tax Contingency
Estimated unrecognized tax benefits, decrease as a result of tax position taken in prior years		$ 2,412,000	$ 12,146,000
Unrecognized tax benefits that would impact effective tax rate	14,708,000	14,708,000
Expense related to the APA settlement that would offset unrecognized tax benefits, if recognized	$ 8,367,000

The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 21

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration