Quarterly report pursuant to Section 13 or 15(d)

Summary of Treasury Stock Activity (Detail)

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Summary of Treasury Stock Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Schedule of Treasury Stock [Line Items]  
Beginning Balance, Shares 3,694,935
Restricted stock withholdings 333,507 [1]
Restricted stock forfeitures 17,388
Ending Balance, Shares 4,045,830
Beginning Balance, Cost $ 51,946
Restricted stock withholdings 9,776 [1]
Restricted stock forfeitures   
Ending Balance, Cost $ 61,722
[1] The Company withheld shares as a result of such election by certain employees to satisfy their tax liabilities upon vesting in restricted stock and restricted stock units. The Company determined the number of shares to be withheld based upon market values ranging from $27.19 to $30.23 per share.