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Capital Stock - Summary of Company's Restricted Shares Issued and Subject to Repurchase (Detail)
1 Months Ended 12 Months Ended
Mar. 19, 2013
Dec. 31, 2013
Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Restricted Stock Awards Outstanding, Beginning balance   1,156,078   
Shares issued subject to vesting during the period   686,273 1,156,078
Unvested shares repurchased        
Shares vested during the period (385,364) (385,364)   
Number of Restricted Stock Awards Outstanding, Ending balance   1,456,987 1,156,078