Stock-Based Compensation Plans (Incentive stock plans) - Additional Information (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2015 shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares of common stock reserved for issuance	3,469
Stock grants counted against the total shares for every share issued	2.7
Stock-based compensation arrangement maximum assumption expected period, years	10 years
Share-based compensation arrangement by share-based payment award vesting period, (in years)	3 years
Description and terms of 2003 incentive stock plan	Incentive stock awards are granted under the Company’s 2003 Incentive Stock Plan, as amended and restated in October 2008 (the “2003 Stock Plan”). Under the 2003 Stock Plan, an aggregate of 3,469 shares of common stock were reserved for issuance. Of this amount, stock grants count against the total shares available under the 2003 Stock Plan as 2.7 shares for every one share issued, while options (and stock appreciation rights (“SAR”) settled in shares) count against the total shares available as one share for every one share issued on the exercise of an option (or SAR). The exercise price of each option granted under the 2003 Stock Plan may not be less than the market price of the Company’s common stock on the date of the option grant and all options may have a maximum life of ten years. Participants receiving restricted stock grants are generally eligible to vote such shares and receive dividends on such shares. Substantially all stock option and restricted stock grants are subject to annual vesting provisions (generally three years) as determined by the compensation committee overseeing the 2003 Stock Plan