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Summary of Changes in Fair Value of Level Three Forward Purchase Contracts (Detail) (Fair Value, Inputs, Level 3, USD $) | 12 Months Ended
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Dec. 31, 2012
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance |
Issuance | 29,317
Adjustments to fair value included in other income (expense) | (1,237)
Transfers to additional paid-in-capital | (28,080)
Ending Balance |
The February 2012 Forward Purchase Contract |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance |
Issuance | 1,080
Adjustments to fair value included in other income (expense) | 12,011
Transfers to additional paid-in-capital | (13,091)
Ending Balance |
The October 2012 Forward Purchase Contract |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance |
Issuance | 28,237
Adjustments to fair value included in other income (expense) | (13,248)
Transfers to additional paid-in-capital | (14,989)
Ending Balance |

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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of settlements that have taken place in relation to financial instruments classified in shareholders' equity measured at fair value and categorized within level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of transfers into financial instruments classified in shareholders' equity measured at fair value and categorized within level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of financial instruments classified in shareholders' equity, measured at fair value using significant unobservable inputs (Level 3), which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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