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Summary of Significant Accounting Policies - Additional Information (Detail)
Share data in Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
USD ($)
|
Jun. 30, 2013
USD ($)
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Dec. 31, 2012
USD ($)
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Jun. 30, 2013
Boa Vista Servicos S.A. [Member]
BRL
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Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
USD ($)
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| Significant Accounting Policies [Line Items] | ||||||||||||
| Antidilutive stock options excluded from computation of earnings per share | 0.1 | 0.1 | ||||||||||
| Fair value of long term debt | $ 1,500,000,000 | $ 1,500,000,000 | $ 1,600,000,000 | |||||||||
| Carrying value of long term debt | 1,400,000,000 | 1,400,000,000 | 1,500,000,000 | |||||||||
| Fair value of interest rate swaps | 8,900,000 | 8,900,000 | 12,200,000 | 8,900,000 | [1] | |||||||
| Interest rate swap term | 5 years | |||||||||||
| Variable interest maximum exposure to loss | 17,400,000 | [2] | 17,400,000 | [2] | ||||||||
| Percentage of interest acquired in Boa Vista Servicos S.A. (BVS) | 15.00% | |||||||||||
| Investment in Boa Vista Servicos S.A. (BVS) | $ 58,700,000 | $ 58,700,000 | $ 63,600,000 | 130,000,000 | ||||||||
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