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Senior Notes - Summary of Fixed-Rate Senior Notes (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2013
Mortgage Loans On Real Estate [Abstract] |
Redemption of notes | The Company may redeem the senior convertible notes any time on or after November 15, 2015, in whole or in part, for cash equal to 100% of the principal amount of the notes plus accrued and unpaid interest through, but excluding, the redemption date. The holders of the senior convertible notes may require the Company to repurchase their notes in whole or in part on specified dates, the first of which is November 15, 2015.

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