Employee Benefits (Detail) - Benefit Plans and Related Amounts Recorded in Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Projected benefit obligation	$ 31,605	[1]	$ 21,160	[1]	$ 19,730	[1]	$ 14,358
Plan assets at fair value (1)	(8,885)	[2]	(2,480)	[2]	(2,130)	[2]
Funded status – shortfall (2)	22,720	[3]	18,680	[3]	17,600	[3]
Other liabilities — accrued pension obligation (2)	22,720	[3]	18,680	[3]	17,600	[3]
Stockholders’ equity — deferred actuarial (loss) gain (3)	$ (1,578)	[4]	$ 2,488	[4]	$ 2,205	[4]

[1] Measured as of December 31.

[2] The plan assets are held by third-party trustees and are invested in a diversified portfolio of equities, high quality government and corporate bonds, and other investments. The assets are primarily valued based on Level 1 and Level 2 inputs under the fair value hierarchy in FASB ASC Topic 820, and the Company considers the overall portfolio of these assets to be of low-to-medium investment risk. For the year-ended December 31, 2012, the Company contributed $6.4 million to these plans, and benefits paid to participants was $0.7 million. While the actual return on plan assets for these plans was effectively zero in 2012, the Company projects a future long-term rate of return on these plan assets of 3.6%, which it believes is reasonable based on the composition of the assets and both current and projected market conditions. In addition to the plan assets held with third-party trustees, the Company also maintains a reinsurance asset arrangement with a large international insurance company. The reinsurance asset is an asset of the Company whose purpose is to provide funding for benefit payments for one of the plans. At December 31, 2012, the reinsurance asset was carried on the Company's Consolidated Balance Sheets at its cash surrender value of $8.8 million and is classified in Other Assets. The Company believes the cash surrender value approximates fair value and is equivalent to a Level 2 input under the FASB's fair value framework in ASC Topic 820.

[3] The Funded status - shortfall represents the amount of the projected benefit obligation that the Company has not funded with a third-party trustee. This amount is a liability of the Company and is recorded in Other Liabilities on the Company's Consolidated Balance Sheets.

[4] The deferred actuarial loss as of December 31, 2012, is recorded in Accumulated Other Comprehensive Income ("AOCI") and will be reclassified out of AOCI and recognized as pension expense over approximately 14 years, subject to certain limitations set forth in FASB ASC Topic 715. The impact of this amortization on the periodic pension expense in 2013 will be immaterial. For 2012, 2011, and 2010, approximately $0.2 million, $0.1 million, and $0.2 million, respectively, of deferred actuarial pension gains were reclassified from AOCI to pension expense. The Company considers the impact of the reclassifications for those years to be immaterial.