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Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 915,361us-gaap_SalesRevenueServicesNet	$ 913,386us-gaap_SalesRevenueServicesNet	$ 893,930us-gaap_SalesRevenueServicesNet	$ 848,449us-gaap_SalesRevenueServicesNet	$ 885,252us-gaap_SalesRevenueServicesNet	$ 882,981us-gaap_SalesRevenueServicesNet	$ 836,685us-gaap_SalesRevenueServicesNet	$ 768,980us-gaap_SalesRevenueServicesNet	$ 3,571,126us-gaap_SalesRevenueServicesNet	$ 3,373,898us-gaap_SalesRevenueServicesNet	$ 3,124,108us-gaap_SalesRevenueServicesNet
Gross margin	89,910us-gaap_GrossProfit	93,196us-gaap_GrossProfit	98,585us-gaap_GrossProfit	88,744us-gaap_GrossProfit	95,088us-gaap_GrossProfit	93,124us-gaap_GrossProfit	95,473us-gaap_GrossProfit	87,338us-gaap_GrossProfit	370,435us-gaap_GrossProfit	371,023us-gaap_GrossProfit	356,066us-gaap_GrossProfit
Operating income	24,777us-gaap_OperatingIncomeLoss	7,677us-gaap_OperatingIncomeLoss	30,927us-gaap_OperatingIncomeLoss	20,496us-gaap_OperatingIncomeLoss	27,251us-gaap_OperatingIncomeLoss	31,295us-gaap_OperatingIncomeLoss	30,464us-gaap_OperatingIncomeLoss	24,737us-gaap_OperatingIncomeLoss	83,877us-gaap_OperatingIncomeLoss	113,747us-gaap_OperatingIncomeLoss	112,360us-gaap_OperatingIncomeLoss
Net income	$ 16,356us-gaap_NetIncomeLoss	$ 4,491us-gaap_NetIncomeLoss	$ 18,676us-gaap_NetIncomeLoss	$ 12,035us-gaap_NetIncomeLoss	$ 16,536us-gaap_NetIncomeLoss	$ 18,600us-gaap_NetIncomeLoss	$ 18,610us-gaap_NetIncomeLoss	$ 15,364us-gaap_NetIncomeLoss	$ 51,558us-gaap_NetIncomeLoss	$ 69,110us-gaap_NetIncomeLoss	$ 67,953us-gaap_NetIncomeLoss
Basic earnings per share	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 1.41us-gaap_EarningsPerShareBasic	$ 1.88us-gaap_EarningsPerShareBasic	$ 1.83us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 1.40us-gaap_EarningsPerShareDiluted	$ 1.87us-gaap_EarningsPerShareDiluted	$ 1.83us-gaap_EarningsPerShareDiluted

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