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Stock-Based Compensation - Summary of Vesting Status of Options Outstanding (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Shares, Non-vested options, Beginning balance 285
Shares, Granted 100
Shares, Vested (57)
Shares, Forfeited 0
Shares, Non-vested options, Ending balance 328
Weighted Average Grant Date Fair Value, Non-vested options, Beginning balance $ 15.00
Weighted Average Grant Date Fair Value, Granted $ 16.73
Weighted Average Grant Date Fair Value, Vested $ 15.00
Weighted Average Grant Date Fair Value, Forfeited $ 0
Weighted Average Grant Date Fair Value, Non-vested options, Ending balance $ 15.53