Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Feb. 26, 2015	Feb. 17, 2015	Jan. 31, 2015
Subsequent Event [Line Items]
Proceeds from bank borrowings	$ 25,000	$ 10,000
Subsequent Event
Subsequent Event [Line Items]
Stock authorized to purchase under stock repurchase program, shares					2,000,000
Repurchase of common stock, shares				0
Proceeds from bank borrowings			10,000
Line of credit facility, amount outstanding			35,000
Subsequent Event | Phantom Stock
Subsequent Event [Line Items]
Shares or units awarded to certain employees					5,020
Fair value of the stock award on the date of grant					169
Subsequent Event | Restricted Stock
Subsequent Event [Line Items]
Shares or units awarded to certain employees					204,395
Fair value of the stock award on the date of grant					$ 6,906
Vesting period					3 years