Goodwill and Other Intangible Assets - Summary of Allocation of Acquisition Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Customer related intangibles [Member]	Dec. 31, 2012 Customer related intangibles [Member]	Dec. 31, 2013 Software acquired [Member]	Dec. 31, 2012 Software acquired [Member]	Dec. 31, 2013 Trade name [Member]	Dec. 31, 2012 Trade name [Member]	Dec. 31, 2013 Lease acquired [Member]	Dec. 31, 2012 Lease acquired [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 121,011	$ 121,011	$ 106,094
Amortizable intangibles, Gross carrying amount	97,046	97,209		60,547	60,547	32,003	32,003	3,109	3,272	1,387	1,387
Weighted average amortization period				15 years	15 years	5 years	5 years	15 years	15 years	5 years	5 years
Accumulated amortization	$ 58,060	$ 51,489		$ 28,864	$ 24,554	$ 26,584	$ 24,505	$ 1,225	$ 1,182	$ 1,387	$ 1,248