|
Assets Held for Sale - Additional Information (Detail) (USD $)
|
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Jun. 30, 2013
|
Dec. 31, 2012
|
Mar. 31, 2013
|
|
| Assets Held for Sale, Liabilities related to Assets Held for Sale and Insurance Proceeds [Line Items] | |||
| Contract receivable | $ 73,196,000 | $ 60,535,000 | |
|
Cheviot Project [Member]
|
|||
| Assets Held for Sale, Liabilities related to Assets Held for Sale and Insurance Proceeds [Line Items] | |||
| Contract receivables monthly payments | 200,000 | ||
| Contract receivables monthly payments end date | Feb. 28, 2013 | ||
| Contract receivable | 30,900,000 | ||
| Provision for loss on contract receivable | $ 14,500,000 |