Effect of Reclassification on the Company's Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Other noncurrent liabilities	$ 8,147	[1]	$ 1,862	[2]
Additional paid-in capital	440,144	[1]	438,858	[2]
Previously Reported
Other noncurrent liabilities	10,506		1,724
Redeemable common stock	5,000		5,000
Additional paid-in capital	$ 435,282		$ 433,996

[1] Restated and Revised, see Notes 2 and 7

[2] Revised, see Note 2