Share-Based Compensation - Summary of Stock Option Activity under Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Options outstanding
Options outstanding, beginning of period (in shares)	204,974	331,174	411,794
Granted (in shares)	0	0	0
Exercised (in shares)	0	(250)	0
Forfeited (in shares)	0	0	(15,250)
Expired (in shares)	(60,500)	(125,950)	(65,370)
Options outstanding, end of period (in shares)	144,474	204,974	331,174
Options exercisable, end of period (in shares)	144,474	204,974	318,279
Options unvested, end of period (in shares)	0	0	12,895
Options outstanding, weighted average exercise price
Options outstanding, beginning of period (in usd per share)	$ 33.94	$ 39.37	$ 39.04
Granted (in usd per share)	0.00	0.00	0.00
Exercised (in usd per share)	0.00	46.20	0.00
Forfeited (in usd per share)	0.00	0.00	42.45
Expired (in usd per share)	50.68	48.21	36.56
Options outstanding, end of period (in usd per share)	26.92	33.94	39.37
Options exercisable, end of period (in usd per share)	26.92	33.94	40.62
Options unvested, end of period (in usd per share)	$ 0.00	$ 0.00	$ 8.64
Options outstanding
Options outstanding, Weighted Average Term, end of period	2 years 1 month 6 days	2 years 4 months 24 days	2 years 2 months 12 days
Options exercisable, Weighted Average Term, end of period	2 years 1 month 6 days	2 years 4 months 24 days	2 years 1 month 6 days
Options unvested, Weighted Average Term, end of period			5 years
Options outstanding, end of period, aggregate intrinsic value
Options outstanding, end of period	$ 0	$ 531	$ 1,708
Options exercisable, end of period	0	531	1,373
Options unvested, end of period	$ 0	$ 0	$ 335